C 64 Kernal ROM
; continuation of EXP function
E000 85 56 STA $56
E002 20 0F BC JSR $BC0F
E005 A5 61 LDA $61
E007 C9 88 CMP #$88
E009 90 03 BCC $E00E
E00B 20 D4 BA JSR $BAD4
E00E 20 CC BC JSR $BCCC
E011 A5 07 LDA $07
E013 18 CLC
E014 69 81 ADC #$81
E016 F0 F3 BEQ $E00B
E018 38 SEC
E019 E9 01 SBC #$01
E01B 48 PHA
E01C A2 05 LDX #$05
E01E B5 69 LDA $69,X
E020 B4 61 LDY $61,X
E022 95 61 STA $61,X
E024 94 69 STY $69,X
E026 CA DEX
E027 10 F5 BPL $E01E
E029 A5 56 LDA $56
E02B 85 70 STA $70
E02D 20 53 B8 JSR $B853
E030 20 B4 BF JSR $BFB4
E033 A9 C4 LDA #$C4
E035 A0 BF LDY #$BF
E037 20 59 E0 JSR $E059
E03A A9 00 LDA #$00
E03C 85 6F STA $6F
E03E 68 PLA
E03F 20 B9 BA JSR $BAB9
E042 60 RTS
; compute odd degrees for SIN and ATN
E043 85 71 STA $71
E045 84 72 STY $72
E047 20 CA BB JSR $BBCA
E04A A9 57 LDA #$57
E04C 20 28 BA JSR $BA28
E04F 20 5D E0 JSR $E05D
E052 A9 57 LDA #$57
E054 A0 00 LDY #$00
E056 4C 28 BA JMP $BA28
; compute polynomials according to table indexed by AY
E059 85 71 STA $71
E05B 84 72 STY $72
E05D 20 C7 BB JSR $BBC7
E060 B1 71 LDA ($71),Y
E062 85 67 STA $67
E064 A4 71 LDY $71
E066 C8 INY
E067 98 TYA
E068 D0 02 BNE $E06C
E06A E6 72 INC $72
E06C 85 71 STA $71
E06E A4 72 LDY $72
E070 20 28 BA JSR $BA28
E073 A5 71 LDA $71
E075 A4 72 LDY $72
E077 18 CLC
E078 69 05 ADC #$05
E07A 90 01 BCC $E07D
E07C C8 INY
E07D 85 71 STA $71
E07F 84 72 STY $72
E081 20 67 B8 JSR $B867
E084 A9 5C LDA #$5C
E086 A0 00 LDY #$00
E088 C6 67 DEC $67
E08A D0 E4 BNE $E070
E08C 60 RTS
; float numbers for RND
E08D .BY $98,$35,$44,$7A,$00
E092 .BY $68,$28,$B1,$46,$00
; RND function
E097 20 2B BC JSR $BC2B
E09A 30 37 BMI $E0D3
E09C D0 20 BNE $E0BE
E09E 20 F3 FF JSR $FFF3
E0A1 86 22 STX $22
E0A3 84 23 STY $23
E0A5 A0 04 LDY #$04
E0A7 B1 22 LDA ($22),Y
E0A9 85 62 STA $62
E0AB C8 INY
E0AC B1 22 LDA ($22),Y
E0AE 85 64 STA $64
E0B0 A0 08 LDY #$08
E0B2 B1 22 LDA ($22),Y
E0B4 85 63 STA $63
E0B6 C8 INY
E0B7 B1 22 LDA ($22),Y
E0B9 85 65 STA $65
E0BB 4C E3 E0 JMP $E0E3
E0BE A9 8B LDA #$8B
E0C0 A0 00 LDY #$00
E0C2 20 A2 BB JSR $BBA2
E0C5 A9 8D LDA #$8D
E0C7 A0 E0 LDY #$E0
E0C9 20 28 BA JSR $BA28
E0CC A9 92 LDA #$92
E0CE A0 E0 LDY #$E0
E0D0 20 67 B8 JSR $B867
E0D3 A6 65 LDX $65
E0D5 A5 62 LDA $62
E0D7 85 65 STA $65
E0D9 86 62 STX $62
E0DB A6 63 LDX $63
E0DD A5 64 LDA $64
E0DF 85 63 STA $63
E0E1 86 64 STX $64
E0E3 A9 00 LDA #$00
E0E5 85 66 STA $66
E0E7 A5 61 LDA $61
E0E9 85 70 STA $70
E0EB A9 80 LDA #$80
E0ED 85 61 STA $61
E0EF 20 D7 B8 JSR $B8D7
E0F2 A2 8B LDX #$8B
E0F4 A0 00 LDY #$00
E0F6 4C D4 BB JMP $BBD4
; handle errors for direct I/O, calls from basic
E0F9 C9 F0 CMP #$F0
E0FB D0 07 BNE $E104
E0FD 84 38 STY $38
E0FF 86 37 STX $37
E101 4C 63 A6 JMP $A663
E104 AA TAX
E105 D0 02 BNE $E109
E107 A2 1E LDX #$1E
E109 4C 37 A4 JMP $A437
E10C 20 D2 FF JSR $FFD2
E10F B0 E8 BCS $E0F9
E111 60 RTS
E112 20 CF FF JSR $FFCF
E115 B0 E2 BCS $E0F9
E117 60 RTS
E118 20 AD E4 JSR $E4AD
E11B B0 DC BCS $E0F9
E11D 60 RTS
E11E 20 C6 FF JSR $FFC6
E121 B0 D6 BCS $E0F9
E123 60 RTS
E124 20 E4 FF JSR $FFE4
E127 B0 D0 BCS $E0F9
E129 60 RTS
; SYS command
E12A 20 8A AD JSR $AD8A
E12D 20 F7 B7 JSR $B7F7
E130 A9 E1 LDA #$E1 ; low E146
E132 48 PHA
E133 A9 46 LDA #$46 ; high E146
E135 48 PHA
E136 AD 0F 03 LDA $030F
E139 48 PHA
E13A AD 0C 03 LDA $030C
E13D AE 0D 03 LDX $030D
E140 AC 0E 03 LDY $030E
E143 28 PLP
E144 6C 14 00 JMP ($0014)
E147 08 PHP
E148 8D 0C 03 STA $030C
E14B 8E 0D 03 STX $030D
E14E 8C 0E 03 STY $030E
E151 68 PLA
E152 8D 0F 03 STA $030F
E155 60 RTS
; SAVE command
E156 20 D4 E1 JSR $E1D4
E159 A6 2D LDX $2D
E15B A4 2E LDY $2E
E15D A9 2B LDA #$2B
E15F 20 D8 FF JSR $FFD8
E162 B0 95 BCS $E0F9
E164 60 RTS
; VERIFY command
E165 A9 01 LDA #$01
E167 .BY $2C
; LOAD command
E168 A9 00 LDA #$00
E16A 85 0A STA $0A
E16C 20 D4 E1 JSR $E1D4
E16F A5 0A LDA $0A
E171 A6 2B LDX $2B
E173 A4 2C LDY $2C
E175 20 D5 FF JSR $FFD5
E178 B0 57 BCS $E1D1
E17A A5 0A LDA $0A
E17C F0 17 BEQ $E195
E17E A2 1C LDX #$1C
E180 20 B7 FF JSR $FFB7
E183 29 10 AND #$10
E185 D0 17 BNE $E19E
E187 A5 7A LDA $7A
E189 C9 02 CMP #$02
E18B F0 07 BEQ $E194
E18D A9 64 LDA #$64
E18F A0 A3 LDY #$A3
E191 4C 1E AB JMP $AB1E
E194 60 RTS
E195 20 B7 FF JSR $FFB7
E198 29 BF AND #$BF
E19A F0 05 BEQ $E1A1
E19C A2 1D LDX #$1D
E19E 4C 37 A4 JMP $A437
E1A1 A5 7B LDA $7B
E1A3 C9 02 CMP #$02
E1A5 D0 0E BNE $E1B5
E1A7 86 2D STX $2D
E1A9 84 2E STY $2E
E1AB A9 76 LDA #$76
E1AD A0 A3 LDY #$A3
E1AF 20 1E AB JSR $AB1E
E1B2 4C 2A A5 JMP $A52A
E1B5 20 8E A6 JSR $A68E
E1B8 20 33 A5 JSR $A533
E1BB 4C 77 A6 JMP $A677
; OPEN command
E1BE 20 19 E2 JSR $E219
E1C1 20 C0 FF JSR $FFC0
E1C4 B0 0B BCS $E1D1
E1C6 60 RTS
; CLOSE command
E1C7 20 19 E2 JSR $E219
E1CA A5 49 LDA $49
E1CC 20 C3 FF JSR $FFC3
E1CF 90 C3 BCC $E194
E1D1 4C F9 E0 JMP $E0F9
; set parameters for load/verify/save
E1D4 A9 00 LDA #$00
E1D6 20 BD FF JSR $FFBD
E1D9 A2 01 LDX #$01
E1DB A0 00 LDY #$00
E1DD 20 BA FF JSR $FFBA
E1E0 20 06 E2 JSR $E206
E1E3 20 57 E2 JSR $E257
E1E6 20 06 E2 JSR $E206
E1E9 20 00 E2 JSR $E200
E1EC A0 00 LDY #$00
E1EE 86 49 STX $49
E1F0 20 BA FF JSR $FFBA
E1F3 20 06 E2 JSR $E206
E1F6 20 00 E2 JSR $E200
E1F9 8A TXA
E1FA A8 TAY
E1FB A6 49 LDX $49
E1FD 4C BA FF JMP $FFBA
; skip comma and get integer in X
E200 20 0E E2 JSR $E20E
E203 4C 9E B7 JMP $B79E
; get character and check for end of line
E206 20 79 00 JSR $0079
E209 D0 02 BNE $E20D
E20B 68 PLA
E20C 68 PLA
E20D 60 RTS
; check for comma and skip it
E20E 20 FD AE JSR $AEFD
E211 20 79 00 JSR $0079
E214 D0 F7 BNE $E20D
E216 4C 08 AF JMP $AF08
; get open/close parameters
E219 A9 00 LDA #$00
E21B 20 BD FF JSR $FFBD
E21E 20 11 E2 JSR $E211
E221 20 9E B7 JSR $B79E
E224 86 49 STX $49
E226 8A TXA
E227 A2 01 LDX #$01
E229 A0 00 LDY #$00
E22B 20 BA FF JSR $FFBA
E22E 20 06 E2 JSR $E206
E231 20 00 E2 JSR $E200
E234 86 4A STX $4A
E236 A0 00 LDY #$00
E238 A5 49 LDA $49
E23A E0 03 CPX #$03
E23C 90 01 BCC $E23F
E23E 88 DEY
E23F 20 BA FF JSR $FFBA
E242 20 06 E2 JSR $E206
E245 20 00 E2 JSR $E200
E248 8A TXA
E249 A8 TAY
E24A A6 4A LDX $4A
E24C A5 49 LDA $49
E24E 20 BA FF JSR $FFBA
E251 20 06 E2 JSR $E206
E254 20 0E E2 JSR $E20E
E257 20 9E AD JSR $AD9E
E25A 20 A3 B6 JSR $B6A3
E25D A6 22 LDX $22
E25F A4 23 LDY $23
E261 4C BD FF JMP $FFBD
; COS function
E264 A9 E0 LDA #$E0 ; low E2E0
E266 A0 E2 LDY #$E2 ; high E2E0
E268 20 67 B8 JSR $B867
; SIN function
E26B 20 0C BC JSR $BC0C
E26E A9 E5 LDA #$E5 ; low E2E5
E270 A0 E2 LDY #$E2 ; high E2E5
E272 A6 6E LDX $6E
E274 20 07 BB JSR $BB07
E277 20 0C BC JSR $BC0C
E27A 20 CC BC JSR $BCCC
E27D A9 00 LDA #$00
E27F 85 6F STA $6F
E281 20 53 B8 JSR $B853
E284 A9 EA LDA #$EA ; low E2EA
E286 A0 E2 LDY #$E2 ; high E2EA
E288 20 50 B8 JSR $B850
E28B A5 66 LDA $66
E28D 48 PHA
E28E 10 0D BPL $E29D
E290 20 49 B8 JSR $B849
E293 A5 66 LDA $66
E295 30 09 BMI $E2A0
E297 A5 12 LDA $12
E299 49 FF EOR #$FF
E29B 85 12 STA $12
E29D 20 B4 BF JSR $BFB4
E2A0 A9 EA LDA #$EA ; low E2EA
E2A2 A0 E2 LDY #$E2 ; high E2EA
E2A4 20 67 B8 JSR $B867
E2A7 68 PLA
E2A8 10 03 BPL $E2AD
E2AA 20 B4 BF JSR $BFB4
E2AD A9 EF LDA #$EF
E2AF A0 E2 LDY #$E2
E2B1 4C 43 E0 JMP $E043
; TAN function
E2B4 20 CA BB JSR $BBCA
E2B7 A9 00 LDA #$00
E2B9 85 12 STA $12
E2BB 20 6B E2 JSR $E26B
E2BE A2 4E LDX #$4E ; low 004E
E2C0 A0 00 LDY #$00 ; high 004E
E2C2 20 F6 E0 JSR $E0F6
E2C5 A9 57 LDA #$57 ; low 005F
E2C7 A0 00 LDY #$00 ; high 005F
E2C9 20 A2 BB JSR $BBA2
E2CC A9 00 LDA #$00
E2CE 85 66 STA $66
E2D0 A5 12 LDA $12
E2D2 20 DC E2 JSR $E2DC
E2D5 A9 4E LDA #$4E ; low 004E
E2D7 A0 00 LDY #$00 ; high 004E
E2D9 4C 0F BB JMP $BB0F
E2DC 48 PHA
E2DD 4C 9D E2 JMP $E29D
; float numbers for SIN, COS and TAN
E2E0 .BY $81,$49,$0F,$DA,$A2 ; 0.5 * PI
E2E5 .BY $83,$49,$0F,$DA,$A2 ; 2 * PI
E2EA .BY $7F,$00,$00,$00,$00 ; 0,25
; polynomial table
E2EF .BY $05 ; degree 6
E2F0 .BY $84,$E6,$1A,$2D,$1B
E2F5 .BY $86,$28,$07,$FB,$F8
E2FA .BY $87,$99,$68,$89,$01
E2FF .BY $87,$23,$35,$DF,$E1
E304 .BY $86,$A5,$5D,$E7,$28
E309 .BY $83,$49,$0F,$DA,$A2
; ATN function
E30E A5 66 LDA $66
E310 48 PHA
E311 10 03 BPL $E316
E313 20 B4 BF JSR $BFB4
E316 A5 61 LDA $61
E318 48 PHA
E319 C9 81 CMP #$81
E31B 90 07 BCC $E324
E31D A9 BC LDA #$BC ; low B9BC
E31F A0 B9 LDY #$B9 ; high B9BC
E321 20 0F BB JSR $BB0F
E324 A9 3E LDA #$3E ; low E33E
E326 A0 E3 LDY #$E3 ; high E33E
E328 20 43 E0 JSR $E043
E32B 68 PLA
E32C C9 81 CMP #$81
E32E 90 07 BCC $E337
E330 A9 E0 LDA #$E0 ; low E2E0
E332 A0 E2 LDY #$E2 ; high E2E0
E334 20 50 B8 JSR $B850
E337 68 PLA
E338 10 03 BPL $E33D
E33A 4C B4 BF JMP $BFB4
E33D 60 RTS
; float numbers for ATN, polynomial table
E33E .BY $0B ; degree 12
E33F .BY $76,$B3,$83,$BD,$D3
E344 .BY $79,$1E,$F4,$A6,$F5
E349 .BY $7B,$83,$FC,$B0,$10
E34E .BY $7C,$0C,$1F,$67,$CA
E353 .BY $7C,$DE,$53,$CB,$C1
E358 .BY $7D,$14,$64,$70,$4C
E35D .BY $7D,$B7,$EA,$51,$7A
E362 .BY $7D,$63,$30,$88,$7E
E367 .BY $7E,$92,$44,$99,$3A
E36C .BY $7E,$4C,$CC,$91,$C7
E371 .BY $7F,$AA,$AA,$AA,$13
E376 .BY $81,$00,$00,$00,$00
; warm start entry
E37B 20 CC FF JSR $FFCC
E37E A9 00 LDA #$00
E380 85 13 STA $13
E382 20 7A A6 JSR $A67A
E385 58 CLI
E386 A2 80 LDX #$80
E388 6C 00 03 JMP ($0300) ; normally E38B
; handle error messages
E38B 8A TXA
E38C 30 03 BMI $E391
E38E 4C 3A A4 JMP $A43A
E391 4C 74 A4 JMP $A474
; RESET routine
E394 20 53 E4 JSR $E453
E397 20 BF E3 JSR $E3BF
E39A 20 22 E4 JSR $E422
E39D A2 FB LDX #$FB
E39F 9A TXS
E3A0 D0 E4 BNE $E386
; character fetch code for zero page $0073-$008F
E3A2 E6 7A INC $7A
E3A4 D0 02 BNE $E3A8
E3A6 E6 7B INC $7B
E3A8 AD 60 EA LDA $EA60
E3AB C9 3A CMP #$3A ; colon
E3AD B0 0A BCS $E3B9
E3AF C9 20 CMP #$20 ; space
E3B1 F0 EF BEQ $E3A2
E3B3 38 SEC
E3B4 E9 30 SBC #$30 ; 0
E3B6 38 SEC
E3B7 E9 D0 SBC #$D0
E3B9 60 RTS
; first RND seed value
E3BA .BY $80,$4F,$C7,$52,$58
; initialisation of basic
E3BF A9 4C LDA #$4C
E3C1 85 54 STA $54
E3C3 8D 10 03 STA $0310
E3C6 A9 48 LDA #$48 ; low B248
E3C8 A0 B2 LDY #$B2 ; high B248
E3CA 8D 11 03 STA $0311
E3CD 8C 12 03 STY $0312
E3D0 A9 91 LDA #$91 ; lowh B391
E3D2 A0 B3 LDY #$B3 ; high B391
E3D4 85 05 STA $05
E3D6 84 06 STY $06
E3D8 A9 AA LDA #$AA ; low B1AA
E3DA A0 B1 LDY #$B1 ; high B1AA
E3DC 85 03 STA $03
E3DE 84 04 STY $04
E3E0 A2 1C LDX #$1C
E3E2 BD A2 E3 LDA $E3A2,X
E3E5 95 73 STA $73,X
E3E7 CA DEX
E3E8 10 F8 BPL $E3E2
E3EA A9 03 LDA #$03
E3EC 85 53 STA $53
E3EE A9 00 LDA #$00
E3F0 85 68 STA $68
E3F2 85 13 STA $13
E3F4 85 18 STA $18
E3F6 A2 01 LDX #$01
E3F8 8E FD 01 STX $01FD
E3FB 8E FC 01 STX $01FC
E3FE A2 19 LDX #$19
E400 86 16 STX $16
E402 38 SEC
E403 20 9C FF JSR $FF9C
E406 86 2B STX $2B
E408 84 2C STY $2C
E40A 38 SEC
E40B 20 99 FF JSR $FF99
E40E 86 37 STX $37
E410 84 38 STY $38
E412 86 33 STX $33
E414 84 34 STY $34
E416 A0 00 LDY #$00
E418 98 TYA
E419 91 2B STA ($2B),Y
E41B E6 2B INC $2B
E41D D0 02 BNE $E421
E41F E6 2C INC $2C
E421 60 RTS
; print BASIC start up messages
E422 A5 2B LDA $2B
E424 A4 2C LDY $2C
E426 20 08 A4 JSR $A408
E429 A9 73 LDA #$73 ; low E473
E42B A0 E4 LDY #$E4 ; high E473
E42D 20 1E AB JSR $AB1E
E430 A5 37 LDA $37
E432 38 SEC
E433 E5 2B SBC $2B
E435 AA TAX
E436 A5 38 LDA $38
E438 E5 2C SBC $2C
E43A 20 CD BD JSR $BDCD
E43D A9 60 LDA #$60 ; low E460
E43F A0 E4 LDY #$E4 ; high E460
E441 20 1E AB JSR $AB1E
E444 4C 44 A6 JMP $A644
; vectors for $0300-$030B
E447 .WD $E38B
E449 .WD $A483
E44B .WD $A57C
E44D .WD $A71A
E44F .WD $A7E4
E451 .WD $AE86
; initialise vectors
E453 A2 0B LDX #$0B
E455 BD 47 E4 LDA $E447,X
E458 9D 00 03 STA $0300,X
E45B CA DEX
E45C 10 F7 BPL $E455
E45E 60 RTS
; startup messages
E45F .BY $00
E460 .BY $20,$42,$41,$53,$49,$43 ; basic bytes free
E466 .BY $20,$42,$59,$54,$45,$53
E46C .BY $20,$46,$52,$45,$45
E471 .BY $0D
E472 .BY $00
E473 .BY $93,$0D,$20,$20,$20 ; **** commodore 64 basic v2 ****
E478 .BY $20,$2A,$2A,$2A,$2A
E47D .BY $20,$43,$4F,$4D,$4D,
E482 .BY $4F,$44,$4F,$52,$45
E487 .BY $20,$36,$34
E48A .BY $20,$42,$41,$53,$49,$43
E490 .BY $20,$56,$32
E493 .BY $20,$2A,$2A,$2A,$2A
E498 .BY $0D,$0D
E49A .BY $20,$36,$34,$4B ; 64k ram system
E49E .BY $20,$52,$41,$4D
E4A2 .BY $20,$53,$59,$53,$54,$45,$4D
E4A9 .BY $20,$20
E4AB .BY $00
E4AC .BY $81
; set output device
E4AD 48 PHA
E4AE 20 C9 FF JSR $FFC9
E4B1 AA TAX
E4B2 68 PLA
E4B3 90 01 BCC $E4B6
E4B5 8A TXA
E4B6 60 RTS
; unused
E4B7 .BY $AA,$AA,$AA,$AA,$AA,$AA,$AA,$AA
E4BF .BY $AA,$AA,$AA,$AA,$AA,$AA,$AA,$AA
E4C7 .BY $AA,$AA,$AA,$AA,$AA,$AA,$AA,$AA
E4CF .BY $AA,$AA,$AA,$AA
E4D3 85 A9 STA $A9
E4D5 A9 01 LDA #$01
E4D7 85 AB STA $AB
E4D9 60 RTS
; clear byte in color ram
E4DA AD 86 02 LDA $0286
E4DD 91 F3 STA ($F3),Y
E4DF 60 RTS
; pause after finding a file on casette
E4E0 69 02 ADC #$02
E4E2 A4 91 LDY $91
E4E4 C8 INY
E4E5 D0 04 BNE $E4EB
E4E7 C5 A1 CMP $A1
E4E9 D0 F7 BNE $E4E2
E4EB 60 RTS
; baud rate factor table
E4EC .WD $2619 ; 50
E4EE .WD $1944 ; 75
E4F0 .WD $111A ; 110
E4F2 .WD $0DE8 ; 134.5
E4F4 .WD $0C70 ; 150
E4F6 .WD $0606 ; 300
E4F8 .WD $02D1 ; 600
E4FA .WD $0137 ; 1200
E4FC .WD $00AE ; 1800
E4FE .WD $0069 ; 2400
; read base address of I/O device into XY
E500 A2 00 LDX #$00 ; low DC00
E502 A0 DC LDY #$DC ; high DC00
E504 60 RTS
; read screen size
E505 A2 28 LDX #$28 ; 40 columns
E507 A0 19 LDY #$19 ; 25 rows
E509 60 RTS
; read/set XY cursor position
E50A B0 07 BCS $E513
E50C 86 D6 STX $D6
E50E 84 D3 STY $D3
E510 20 6C E5 JSR $E56C
E513 A6 D6 LDX $D6
E515 A4 D3 LDY $D3
E517 60 RTS
; initialise screen and keyboard
E518 20 A0 E5 JSR $E5A0
E51B A9 00 LDA #$00
E51D 8D 91 02 STA $0291
E520 85 CF STA $CF
E522 A9 48 LDA #$48 ; low EB48
E524 8D 8F 02 STA $028F
E527 A9 EB LDA #$EB ; high EB48
E529 8D 90 02 STA $0290
E52C A9 0A LDA #$0A
E52E 8D 89 02 STA $0289
E531 8D 8C 02 STA $028C
E534 A9 0E LDA #$0E
E536 8D 86 02 STA $0286
E539 A9 04 LDA #$04
E53B 8D 8B 02 STA $028B
E53E A9 0C LDA #$0C
E540 85 CD STA $CD
E542 85 CC STA $CC
E544 AD 88 02 LDA $0288
E547 09 80 ORA #$80
E549 A8 TAY
E54A A9 00 LDA #$00
E54C AA TAX
E54D 94 D9 STY $D9,X
E54F 18 CLC
E550 69 28 ADC #$28
E552 90 01 BCC $E555
E554 C8 INY
E555 E8 INX
E556 E0 1A CPX #$1A
E558 D0 F3 BNE $E54D
E55A A9 FF LDA #$FF
E55C 95 D9 STA $D9,X
E55E A2 18 LDX #$18
E560 20 FF E9 JSR $E9FF
E563 CA DEX
E564 10 FA BPL $E560
E566 A0 00 LDY #$00
E568 84 D3 STY $D3
E56A 84 D6 STY $D6
; set address of curent screen line
E56C A6 D6 LDX $D6
E56E A5 D3 LDA $D3
E570 B4 D9 LDY $D9,X
E572 30 08 BMI $E57C
E574 18 CLC
E575 69 28 ADC #$28
E577 85 D3 STA $D3
E579 CA DEX
E57A 10 F4 BPL $E570
E57C 20 F0 E9 JSR $E9F0
E57F A9 27 LDA #$27
E581 E8 INX
E582 B4 D9 LDY $D9,X
E584 30 06 BMI $E58C
E586 18 CLC
E587 69 28 ADC #$28
E589 E8 INX
E58A 10 F6 BPL $E582
E58C 85 D5 STA $D5
E58E 4C 24 EA JMP $EA24
E591 E4 C9 CPX $C9
E593 F0 03 BEQ $E598
E595 4C ED E6 JMP $E6ED
E598 60 RTS
E599 EA NOP
; this code is unused by the rom, no jumps to this location!
E59A 20 A0 E5 JSR $E5A0
E59D 4C 66 E5 JMP $E566
; initialise vic chip
E5A0 A9 03 LDA #$03
E5A2 85 9A STA $9A
E5A4 A9 00 LDA #$00
E5A6 85 99 STA $99
E5A8 A2 2F LDX #$2F
E5AA BD B8 EC LDA $ECB8,X
E5AD 9D FF CF STA $CFFF,X
E5B0 CA DEX
E5B1 D0 F7 BNE $E5AA
E5B3 60 RTS
; get character from keyboard buffer
E5B4 AC 77 02 LDY $0277
E5B7 A2 00 LDX #$00
E5B9 BD 78 02 LDA $0278,X
E5BC 9D 77 02 STA $0277,X
E5BF E8 INX
E5C0 E4 C6 CPX $C6
E5C2 D0 F5 BNE $E5B9
E5C4 C6 C6 DEC $C6
E5C6 98 TYA
E5C7 58 CLI
E5C8 18 CLC
E5C9 60 RTS
; wait for return for keyboard
E5CA 20 16 E7 JSR $E716
E5CD A5 C6 LDA $C6
E5CF 85 CC STA $CC
E5D1 8D 92 02 STA $0292
E5D4 F0 F7 BEQ $E5CD
E5D6 78 SEI
E5D7 A5 CF LDA $CF
E5D9 F0 0C BEQ $E5E7
E5DB A5 CE LDA $CE
E5DD AE 87 02 LDX $0287
E5E0 A0 00 LDY #$00
E5E2 84 CF STY $CF
E5E4 20 13 EA JSR $EA13
E5E7 20 B4 E5 JSR $E5B4
E5EA C9 83 CMP #$83
E5EC D0 10 BNE $E5FE
E5EE A2 09 LDX #$09
E5F0 78 SEI
E5F1 86 C6 STX $C6
E5F3 BD E6 EC LDA $ECE6,X
E5F6 9D 76 02 STA $0276,X
E5F9 CA DEX
E5FA D0 F7 BNE $E5F3
E5FC F0 CF BEQ $E5CD
E5FE C9 0D CMP #$0D
E600 D0 C8 BNE $E5CA
E602 A4 D5 LDY $D5
E604 84 D0 STY $D0
E606 B1 D1 LDA ($D1),Y
E608 C9 20 CMP #$20
E60A D0 03 BNE $E60F
E60C 88 DEY
E60D D0 F7 BNE $E606
E60F C8 INY
E610 84 C8 STY $C8
E612 A0 00 LDY #$00
E614 8C 92 02 STY $0292
E617 84 D3 STY $D3
E619 84 D4 STY $D4
E61B A5 C9 LDA $C9
E61D 30 1B BMI $E63A
E61F A6 D6 LDX $D6
E621 20 91 E5 JSR $E591
E624 E4 C9 CPX $C9
E626 D0 12 BNE $E63A
E628 A5 CA LDA $CA
E62A 85 D3 STA $D3
E62C C5 C8 CMP $C8
E62E 90 0A BCC $E63A
E630 B0 2B BCS $E65D
; get character from device 0 or 3
E632 98 TYA
E633 48 PHA
E634 8A TXA
E635 48 PHA
E636 A5 D0 LDA $D0
E638 F0 93 BEQ $E5CD
; get character from current screen line
E63A A4 D3 LDY $D3
E63C B1 D1 LDA ($D1),Y
E63E 85 D7 STA $D7
E640 29 3F AND #$3F
E642 06 D7 ASL $D7
E644 24 D7 BIT $D7
E646 10 02 BPL $E64A
E648 09 80 ORA #$80
E64A 90 04 BCC $E650
E64C A6 D4 LDX $D4
E64E D0 04 BNE $E654
E650 70 02 BVS $E654
E652 09 40 ORA #$40
E654 E6 D3 INC $D3
E656 20 84 E6 JSR $E684
E659 C4 C8 CPY $C8
E65B D0 17 BNE $E674
E65D A9 00 LDA #$00
E65F 85 D0 STA $D0
E661 A9 0D LDA #$0D
E663 A6 99 LDX $99
E665 E0 03 CPX #$03
E667 F0 06 BEQ $E66F
E669 A6 9A LDX $9A
E66B E0 03 CPX #$03
E66D F0 03 BEQ $E672
E66F 20 16 E7 JSR $E716
E672 A9 0D LDA #$0D
E674 85 D7 STA $D7
E676 68 PLA
E677 AA TAX
E678 68 PLA
E679 A8 TAY
E67A A5 D7 LDA $D7
E67C C9 DE CMP #$DE ; screen PI code
E67E D0 02 BNE $E682
E680 A9 FF LDA #$FF ; petscii PI code
E682 18 CLC
E683 60 RTS
; check for quote mark and set flag
E684 C9 22 CMP #$22 ; quote mark
E686 D0 08 BNE $E690
E688 A5 D4 LDA $D4
E68A 49 01 EOR #$01
E68C 85 D4 STA $D4
E68E A9 22 LDA #$22 ; quote mark
E690 60 RTS
; fill screen at current position
E691 09 40 ORA #$40
E693 A6 C7 LDX $C7
E695 F0 02 BEQ $E699
E697 09 80 ORA #$80
E699 A6 D8 LDX $D8
E69B F0 02 BEQ $E69F
E69D C6 D8 DEC $D8
E69F AE 86 02 LDX $0286
E6A2 20 13 EA JSR $EA13
E6A5 20 B6 E6 JSR $E6B6
; return from output to the screen
E6A8 68 PLA
E6A9 A8 TAY
E6AA A5 D8 LDA $D8
E6AC F0 02 BEQ $E6B0
E6AE 46 D4 LSR $D4
E6B0 68 PLA
E6B1 AA TAX
E6B2 68 PLA
E6B3 18 CLC
E6B4 58 CLI
E6B5 60 RTS
; get/insert new line
E6B6 20 B3 E8 JSR $E8B3
E6B9 E6 D3 INC $D3
E6BB A5 D5 LDA $D5
E6BD C5 D3 CMP $D3
E6BF B0 3F BCS $E700
E6C1 C9 4F CMP #$4F
E6C3 F0 32 BEQ $E6F7
E6C5 AD 92 02 LDA $0292
E6C8 F0 03 BEQ $E6CD
E6CA 4C 67 E9 JMP $E967
E6CD A6 D6 LDX $D6
E6CF E0 19 CPX #$19
E6D1 90 07 BCC $E6DA
E6D3 20 EA E8 JSR $E8EA
E6D6 C6 D6 DEC $D6
E6D8 A6 D6 LDX $D6
E6DA 16 D9 ASL $D9,X
E6DC 56 D9 LSR $D9,X
E6DE E8 INX
E6DF B5 D9 LDA $D9,X
E6E1 09 80 ORA #$80
E6E3 95 D9 STA $D9,X
E6E5 CA DEX
E6E6 A5 D5 LDA $D5
E6E8 18 CLC
E6E9 69 28 ADC #$28
E6EB 85 D5 STA $D5
E6ED B5 D9 LDA $D9,X
E6EF 30 03 BMI $E6F4
E6F1 CA DEX
E6F2 D0 F9 BNE $E6ED
E6F4 4C F0 E9 JMP $E9F0
E6F7 C6 D6 DEC $D6
E6F9 20 7C E8 JSR $E87C
E6FC A9 00 LDA #$00
E6FE 85 D3 STA $D3
E700 60 RTS
; move backwards over a line boundary
E701 A6 D6 LDX $D6
E703 D0 06 BNE $E70B
E705 86 D3 STX $D3
E707 68 PLA
E708 68 PLA
E709 D0 9D BNE $E6A8
E70B CA DEX
E70C 86 D6 STX $D6
E70E 20 6C E5 JSR $E56C
E711 A4 D5 LDY $D5
E713 84 D3 STY $D3
E715 60 RTS
; put a character to screen
E716 48 PHA
E717 85 D7 STA $D7
E719 8A TXA
E71A 48 PHA
E71B 98 TYA
E71C 48 PHA
E71D A9 00 LDA #$00
E71F 85 D0 STA $D0
E721 A4 D3 LDY $D3
E723 A5 D7 LDA $D7
E725 10 03 BPL $E72A
E727 4C D4 E7 JMP $E7D4
E72A C9 0D CMP #$0D ; return code
E72C D0 03 BNE $E731
E72E 4C 91 E8 JMP $E891
E731 C9 20 CMP #$20
E733 90 10 BCC $E745
E735 C9 60 CMP #$60
E737 90 04 BCC $E73D
E739 29 DF AND #$DF
E73B D0 02 BNE $E73F
E73D 29 3F AND #$3F
E73F 20 84 E6 JSR $E684
E742 4C 93 E6 JMP $E693
E745 A6 D8 LDX $D8
E747 F0 03 BEQ $E74C
E749 4C 97 E6 JMP $E697
E74C C9 14 CMP #$14 ; delete code
E74E D0 2E BNE $E77E
E750 98 TYA
E751 D0 06 BNE $E759
E753 20 01 E7 JSR $E701
E756 4C 73 E7 JMP $E773
E759 20 A1 E8 JSR $E8A1
E75C 88 DEY
E75D 84 D3 STY $D3
E75F 20 24 EA JSR $EA24
E762 C8 INY
E763 B1 D1 LDA ($D1),Y
E765 88 DEY
E766 91 D1 STA ($D1),Y
E768 C8 INY
E769 B1 F3 LDA ($F3),Y
E76B 88 DEY
E76C 91 F3 STA ($F3),Y
E76E C8 INY
E76F C4 D5 CPY $D5
E771 D0 EF BNE $E762
E773 A9 20 LDA #$20 ; space
E775 91 D1 STA ($D1),Y
E777 AD 86 02 LDA $0286
E77A 91 F3 STA ($F3),Y
E77C 10 4D BPL $E7CB
E77E A6 D4 LDX $D4
E780 F0 03 BEQ $E785
E782 4C 97 E6 JMP $E697
E785 C9 12 CMP #$12 ; reverse code
E787 D0 02 BNE $E78B
E789 85 C7 STA $C7
E78B C9 13 CMP #$13 ; home code
E78D D0 03 BNE $E792
E78F 20 66 E5 JSR $E566
E792 C9 1D CMP #$1D ; csr right
E794 D0 17 BNE $E7AD
E796 C8 INY
E797 20 B3 E8 JSR $E8B3
E79A 84 D3 STY $D3
E79C 88 DEY
E79D C4 D5 CPY $D5
E79F 90 09 BCC $E7AA
E7A1 C6 D6 DEC $D6
E7A3 20 7C E8 JSR $E87C
E7A6 A0 00 LDY #$00
E7A8 84 D3 STY $D3
E7AA 4C A8 E6 JMP $E6A8
E7AD C9 11 CMP #$11 ; csr down
E7AF D0 1D BNE $E7CE
E7B1 18 CLC
E7B2 98 TYA
E7B3 69 28 ADC #$28
E7B5 A8 TAY
E7B6 E6 D6 INC $D6
E7B8 C5 D5 CMP $D5
E7BA 90 EC BCC $E7A8
E7BC F0 EA BEQ $E7A8
E7BE C6 D6 DEC $D6
E7C0 E9 28 SBC #$28
E7C2 90 04 BCC $E7C8
E7C4 85 D3 STA $D3
E7C6 D0 F8 BNE $E7C0
E7C8 20 7C E8 JSR $E87C
E7CB 4C A8 E6 JMP $E6A8
E7CE 20 CB E8 JSR $E8CB
E7D1 4C 44 EC JMP $EC44
; put shifted chars to screen
E7D4 29 7F AND #$7F ; remove shift bit
E7D6 C9 7F CMP #$7F ; code for PI
E7D8 D0 02 BNE $E7DC
E7DA A9 5E LDA #$5E ; screen PI
E7DC C9 20 CMP #$20
E7DE 90 03 BCC $E7E3
E7E0 4C 91 E6 JMP $E691
E7E3 C9 0D CMP #$0D ; shift return
E7E5 D0 03 BNE $E7EA
E7E7 4C 91 E8 JMP $E891
E7EA A6 D4 LDX $D4
E7EC D0 3F BNE $E82D
E7EE C9 14 CMP #$14 ; insert
E7F0 D0 37 BNE $E829
E7F2 A4 D5 LDY $D5
E7F4 B1 D1 LDA ($D1),Y
E7F6 C9 20 CMP #$20
E7F8 D0 04 BNE $E7FE
E7FA C4 D3 CPY $D3
E7FC D0 07 BNE $E805
E7FE C0 4F CPY #$4F
E800 F0 24 BEQ $E826
E802 20 65 E9 JSR $E965
E805 A4 D5 LDY $D5
E807 20 24 EA JSR $EA24
E80A 88 DEY
E80B B1 D1 LDA ($D1),Y
E80D C8 INY
E80E 91 D1 STA ($D1),Y
E810 88 DEY
E811 B1 F3 LDA ($F3),Y
E813 C8 INY
E814 91 F3 STA ($F3),Y
E816 88 DEY
E817 C4 D3 CPY $D3
E819 D0 EF BNE $E80A
E81B A9 20 LDA #$20
E81D 91 D1 STA ($D1),Y
E81F AD 86 02 LDA $0286
E822 91 F3 STA ($F3),Y
E824 E6 D8 INC $D8
E826 4C A8 E6 JMP $E6A8
E829 A6 D8 LDX $D8
E82B F0 05 BEQ $E832
E82D 09 40 ORA #$40
E82F 4C 97 E6 JMP $E697
E832 C9 11 CMP #$11 ; csr up
E834 D0 16 BNE $E84C
E836 A6 D6 LDX $D6
E838 F0 37 BEQ $E871
E83A C6 D6 DEC $D6
E83C A5 D3 LDA $D3
E83E 38 SEC
E83F E9 28 SBC #$28
E841 90 04 BCC $E847
E843 85 D3 STA $D3
E845 10 2A BPL $E871
E847 20 6C E5 JSR $E56C
E84A D0 25 BNE $E871
E84C C9 12 CMP #$12 ; reverse off
E84E D0 04 BNE $E854
E850 A9 00 LDA #$00
E852 85 C7 STA $C7
E854 C9 1D CMP #$1D ; csr left
E856 D0 12 BNE $E86A
E858 98 TYA
E859 F0 09 BEQ $E864
E85B 20 A1 E8 JSR $E8A1
E85E 88 DEY
E85F 84 D3 STY $D3
E861 4C A8 E6 JMP $E6A8
E864 20 01 E7 JSR $E701
E867 4C A8 E6 JMP $E6A8
E86A C9 13 CMP #$13 ; clr code
E86C D0 06 BNE $E874
E86E 20 44 E5 JSR $E544
E871 4C A8 E6 JMP $E6A8
E874 09 80 ORA #$80
E876 20 CB E8 JSR $E8CB
E879 4C 4F EC JMP $EC4F
; set next line number
E87C 46 C9 LSR $C9
E87E A6 D6 LDX $D6
E880 E8 INX
E881 E0 19 CPX #$19
E883 D0 03 BNE $E888
E885 20 EA E8 JSR $E8EA
E888 B5 D9 LDA $D9,X
E88A 10 F4 BPL $E880
E88C 86 D6 STX $D6
E88E 4C 6C E5 JMP $E56C
; action for return
E891 A2 00 LDX #$00
E893 86 D8 STX $D8
E895 86 C7 STX $C7
E897 86 D4 STX $D4
E899 86 D3 STX $D3
E89B 20 7C E8 JSR $E87C
E89E 4C A8 E6 JMP $E6A8
; move cursor to previous line if at start of line
E8A1 A2 02 LDX #$02
E8A3 A9 00 LDA #$00
E8A5 C5 D3 CMP $D3
E8A7 F0 07 BEQ $E8B0
E8A9 18 CLC
E8AA 69 28 ADC #$28
E8AC CA DEX
E8AD D0 F6 BNE $E8A5
E8AF 60 RTS
E8B0 C6 D6 DEC $D6
E8B2 60 RTS
; move cursor to next line if at end of line
E8B3 A2 02 LDX #$02
E8B5 A9 27 LDA #$27
E8B7 C5 D3 CMP $D3
E8B9 F0 07 BEQ $E8C2
E8BB 18 CLC
E8BC 69 28 ADC #$28
E8BE CA DEX
E8BF D0 F6 BNE $E8B7
E8C1 60 RTS
E8C2 A6 D6 LDX $D6
E8C4 E0 19 CPX #$19
E8C6 F0 02 BEQ $E8CA
E8C8 E6 D6 INC $D6
E8CA 60 RTS
; check for color change codes
E8CB A2 0F LDX #$0F
E8CD DD DA E8 CMP $E8DA,X
E8D0 F0 04 BEQ $E8D6
E8D2 CA DEX
E8D3 10 F8 BPL $E8CD
E8D5 60 RTS
E8D6 8E 86 02 STX $0286
E8D9 60 RTS
; color key codes
E8DA .BY $90,$05,$1C,$9F,$9C,$1E,$1F,$9E
E8E2 .BY $81,$95,$96,$97,$98,$99,$9A,$9B
; scroll screen
E8EA A5 AC LDA $AC
E8EC 48 PHA
E8ED A5 AD LDA $AD
E8EF 48 PHA
E8F0 A5 AE LDA $AE
E8F2 48 PHA
E8F3 A5 AF LDA $AF
E8F5 48 PHA
E8F6 A2 FF LDX #$FF
E8F8 C6 D6 DEC $D6
E8FA C6 C9 DEC $C9
E8FC CE A5 02 DEC $02A5
E8FF E8 INX
E900 20 F0 E9 JSR $E9F0
E903 E0 18 CPX #$18
E905 B0 0C BCS $E913
E907 BD F1 EC LDA $ECF1,X
E90A 85 AC STA $AC
E90C B5 DA LDA $DA,X
E90E 20 C8 E9 JSR $E9C8
E911 30 EC BMI $E8FF
E913 20 FF E9 JSR $E9FF
E916 A2 00 LDX #$00
E918 B5 D9 LDA $D9,X
E91A 29 7F AND #$7F
E91C B4 DA LDY $DA,X
E91E 10 02 BPL $E922
E920 09 80 ORA #$80
E922 95 D9 STA $D9,X
E924 E8 INX
E925 E0 18 CPX #$18
E927 D0 EF BNE $E918
E929 A5 F1 LDA $F1
E92B 09 80 ORA #$80
E92D 85 F1 STA $F1
E92F A5 D9 LDA $D9
E931 10 C3 BPL $E8F6
E933 E6 D6 INC $D6
E935 EE A5 02 INC $02A5
E938 A9 7F LDA #$7F
E93A 8D 00 DC STA $DC00
E93D AD 01 DC LDA $DC01
E940 C9 FB CMP #$FB
E942 08 PHP
E943 A9 7F LDA #$7F
E945 8D 00 DC STA $DC00
E948 28 PLP
E949 D0 0B BNE $E956
E94B A0 00 LDY #$00
E94D EA NOP
E94E CA DEX
E94F D0 FC BNE $E94D
E951 88 DEY
E952 D0 F9 BNE $E94D
E954 84 C6 STY $C6
E956 A6 D6 LDX $D6
E958 68 PLA
E959 85 AF STA $AF
E95B 68 PLA
E95C 85 AE STA $AE
E95E 68 PLA
E95F 85 AD STA $AD
E961 68 PLA
E962 85 AC STA $AC
E964 60 RTS
; insert blank line in screen
E965 A6 D6 LDX $D6
E967 E8 INX
E968 B5 D9 LDA $D9,X
E96A 10 FB BPL $E967
E96C 8E A5 02 STX $02A5
E96F E0 18 CPX #$18
E971 F0 0E BEQ $E981
E973 90 0C BCC $E981
E975 20 EA E8 JSR $E8EA
E978 AE A5 02 LDX $02A5
E97B CA DEX
E97C C6 D6 DEC $D6
E97E 4C DA E6 JMP $E6DA
E981 A5 AC LDA $AC
E983 48 PHA
E984 A5 AD LDA $AD
E986 48 PHA
E987 A5 AE LDA $AE
E989 48 PHA
E98A A5 AF LDA $AF
E98C 48 PHA
E98D A2 19 LDX #$19
E98F CA DEX
E990 20 F0 E9 JSR $E9F0
E993 EC A5 02 CPX $02A5
E996 90 0E BCC $E9A6
E998 F0 0C BEQ $E9A6
E99A BD EF EC LDA $ECEF,X
E99D 85 AC STA $AC
E99F B5 D8 LDA $D8,X
E9A1 20 C8 E9 JSR $E9C8
E9A4 30 E9 BMI $E98F
E9A6 20 FF E9 JSR $E9FF
E9A9 A2 17 LDX #$17
E9AB EC A5 02 CPX $02A5
E9AE 90 0F BCC $E9BF
E9B0 B5 DA LDA $DA,X
E9B2 29 7F AND #$7F
E9B4 B4 D9 LDY $D9,X
E9B6 10 02 BPL $E9BA
E9B8 09 80 ORA #$80
E9BA 95 DA STA $DA,X
E9BC CA DEX
E9BD D0 EC BNE $E9AB
E9BF AE A5 02 LDX $02A5
E9C2 20 DA E6 JSR $E6DA
E9C5 4C 58 E9 JMP $E958
; move one screen line
E9C8 29 03 AND #$03
E9CA 0D 88 02 ORA $0288
E9CD 85 AD STA $AD
E9CF 20 E0 E9 JSR $E9E0
E9D2 A0 27 LDY #$27
E9D4 B1 AC LDA ($AC),Y
E9D6 91 D1 STA ($D1),Y
E9D8 B1 AE LDA ($AE),Y
E9DA 91 F3 STA ($F3),Y
E9DC 88 DEY
E9DD 10 F5 BPL $E9D4
E9DF 60 RTS
; set color and screen addresses
E9E0 20 24 EA JSR $EA24
E9E3 A5 AC LDA $AC
E9E5 85 AE STA $AE
E9E7 A5 AD LDA $AD
E9E9 29 03 AND #$03
E9EB 09 D8 ORA #$D8
E9ED 85 AF STA $AF
E9EF 60 RTS
; fetch screen addresses
E9F0 BD F0 EC LDA $ECF0,X
E9F3 85 D1 STA $D1
E9F5 B5 D9 LDA $D9,X
E9F7 29 03 AND #$03
E9F9 0D 88 02 ORA $0288
E9FC 85 D2 STA $D2
E9FE 60 RTS
; clear one screen line
E9FF A0 27 LDY #$27
EA01 20 F0 E9 JSR $E9F0
EA04 20 24 EA JSR $EA24
EA07 20 DA E4 JSR $E4DA
EA0A A9 20 LDA #$20
EA0C 91 D1 STA ($D1),Y
EA0E 88 DEY
EA0F 10 F6 BPL $EA07
EA11 60 RTS
EA12 EA NOP
; set cursor flash timing and color memory addresses
EA13 A8 TAY
EA14 A9 02 LDA #$02
EA16 85 CD STA $CD
EA18 20 24 EA JSR $EA24
EA1B 98 TYA
; put a char on the screen
EA1C A4 D3 LDY $D3
EA1E 91 D1 STA ($D1),Y
EA20 8A TXA
EA21 91 F3 STA ($F3),Y
EA23 60 RTS
; set color memory adress parallel to screen
EA24 A5 D1 LDA $D1
EA26 85 F3 STA $F3
EA28 A5 D2 LDA $D2
EA2A 29 03 AND #$03
EA2C 09 D8 ORA #$D8
EA2E 85 F4 STA $F4
EA30 60 RTS
; normal IRQ interrupt
EA31 20 EA FF JSR $FFEA ; do clock
EA34 A5 CC LDA $CC ; flash cursor
EA36 D0 29 BNE $EA61
EA38 C6 CD DEC $CD
EA3A D0 25 BNE $EA61
EA3C A9 14 LDA #$14
EA3E 85 CD STA $CD
EA40 A4 D3 LDY $D3
EA42 46 CF LSR $CF
EA44 AE 87 02 LDX $0287
EA47 B1 D1 LDA ($D1),Y
EA49 B0 11 BCS $EA5C
EA4B E6 CF INC $CF
EA4D 85 CE STA $CE
EA4F 20 24 EA JSR $EA24
EA52 B1 F3 LDA ($F3),Y
EA54 8D 87 02 STA $0287
EA57 AE 86 02 LDX $0286
EA5A A5 CE LDA $CE
EA5C 49 80 EOR #$80
EA5E 20 1C EA JSR $EA1C ; display cursor
EA61 A5 01 LDA $01 ; checl cassette sense
EA63 29 10 AND #$10
EA65 F0 0A BEQ $EA71
EA67 A0 00 LDY #$00
EA69 84 C0 STY $C0
EA6B A5 01 LDA $01
EA6D 09 20 ORA #$20
EA6F D0 08 BNE $EA79
EA71 A5 C0 LDA $C0
EA73 D0 06 BNE $EA7B
EA75 A5 01 LDA $01
EA77 29 1F AND #$1F
EA79 85 01 STA $01
EA7B 20 87 EA JSR $EA87 ; scan keyboard
EA7E AD 0D DC LDA $DC0D
EA81 68 PLA
EA82 A8 TAY
EA83 68 PLA
EA84 AA TAX
EA85 68 PLA
EA86 40 RTI
; scan keyboard
EA87 A9 00 LDA #$00
EA89 8D 8D 02 STA $028D
EA8C A0 40 LDY #$40
EA8E 84 CB STY $CB
EA90 8D 00 DC STA $DC00
EA93 AE 01 DC LDX $DC01
EA96 E0 FF CPX #$FF
EA98 F0 61 BEQ $EAFB
EA9A A8 TAY
EA9B A9 81 LDA #$81
EA9D 85 F5 STA $F5
EA9F A9 EB LDA #$EB
EAA1 85 F6 STA $F6
EAA3 A9 FE LDA #$FE
EAA5 8D 00 DC STA $DC00
EAA8 A2 08 LDX #$08
EAAA 48 PHA
EAAB AD 01 DC LDA $DC01
EAAE CD 01 DC CMP $DC01
EAB1 D0 F8 BNE $EAAB
EAB3 4A LSR
EAB4 B0 16 BCS $EACC
EAB6 48 PHA
EAB7 B1 F5 LDA ($F5),Y
EAB9 C9 05 CMP #$05
EABB B0 0C BCS $EAC9
EABD C9 03 CMP #$03
EABF F0 08 BEQ $EAC9
EAC1 0D 8D 02 ORA $028D
EAC4 8D 8D 02 STA $028D
EAC7 10 02 BPL $EACB
EAC9 84 CB STY $CB
EACB 68 PLA
EACC C8 INY
EACD C0 41 CPY #$41
EACF B0 0B BCS $EADC
EAD1 CA DEX
EAD2 D0 DF BNE $EAB3
EAD4 38 SEC
EAD5 68 PLA
EAD6 2A ROL
EAD7 8D 00 DC STA $DC00
EADA D0 CC BNE $EAA8
EADC 68 PLA
EADD 6C 8F 02 JMP ($028F)
EAE0 A4 CB LDY $CB
EAE2 B1 F5 LDA ($F5),Y
EAE4 AA TAX
EAE5 C4 C5 CPY $C5
EAE7 F0 07 BEQ $EAF0
EAE9 A0 10 LDY #$10
EAEB 8C 8C 02 STY $028C
EAEE D0 36 BNE $EB26
EAF0 29 7F AND #$7F
EAF2 2C 8A 02 BIT $028A
EAF5 30 16 BMI $EB0D
EAF7 70 49 BVS $EB42
EAF9 C9 7F CMP #$7F
EAFB F0 29 BEQ $EB26
EAFD C9 14 CMP #$14 ; delete
EAFF F0 0C BEQ $EB0D
EB01 C9 20 CMP #$20 ; space
EB03 F0 08 BEQ $EB0D
EB05 C9 1D CMP #$1D ; csr right/left
EB07 F0 04 BEQ $EB0D
EB09 C9 11 CMP #$11 ; csr up/down
EB0B D0 35 BNE $EB42
EB0D AC 8C 02 LDY $028C
EB10 F0 05 BEQ $EB17
EB12 CE 8C 02 DEC $028C
EB15 D0 2B BNE $EB42
EB17 CE 8B 02 DEC $028B
EB1A D0 26 BNE $EB42
EB1C A0 04 LDY #$04
EB1E 8C 8B 02 STY $028B
EB21 A4 C6 LDY $C6
EB23 88 DEY
EB24 10 1C BPL $EB42
EB26 A4 CB LDY $CB
EB28 84 C5 STY $C5
EB2A AC 8D 02 LDY $028D
EB2D 8C 8E 02 STY $028E
EB30 E0 FF CPX #$FF
EB32 F0 0E BEQ $EB42
EB34 8A TXA
EB35 A6 C6 LDX $C6
EB37 EC 89 02 CPX $0289
EB3A B0 06 BCS $EB42
EB3C 9D 77 02 STA $0277,X
EB3F E8 INX
EB40 86 C6 STX $C6
EB42 A9 7F LDA #$7F
EB44 8D 00 DC STA $DC00
EB47 60 RTS
EB48 AD 8D 02 LDA $028D
EB4B C9 03 CMP #$03
EB4D D0 15 BNE $EB64
EB4F CD 8E 02 CMP $028E
EB52 F0 EE BEQ $EB42
EB54 AD 91 02 LDA $0291
EB57 30 1D BMI $EB76
EB59 AD 18 D0 LDA $D018
EB5C 49 02 EOR #$02
EB5E 8D 18 D0 STA $D018
EB61 4C 76 EB JMP $EB76
; select keyboard table
EB64 0A ASL
EB65 C9 08 CMP #$08
EB67 90 02 BCC $EB6B
EB69 A9 06 LDA #$06
EB6B AA TAX
EB6C BD 79 EB LDA $EB79,X
EB6F 85 F5 STA $F5
EB71 BD 7A EB LDA $EB7A,X
EB74 85 F6 STA $F6
EB76 4C E0 EA JMP $EAE0
; table addresses
EB79 .WD $EB81 ; standard
EB7B .WD $EBC2 ; shift
EB7D .WD $EC03 ; commodore key
EB7F .WD $EC78 ; control
; standard keyboard table
EB81 .BY $14,$0D,$1D,$88,$85,$86,$87,$11
EB89 .BY $33,$57,$41,$34,$5A,$53,$45,$01
EB91 .BY $35,$52,$44,$36,$43,$46,$54,$58
EB99 .BY $37,$59,$47,$38,$42,$48,$55,$56
EBA1 .BY $39,$49,$4A,$30,$4D,$4B,$4F,$4E
EBA9 .BY $2B,$50,$4C,$2D,$2E,$3A,$40,$2C
EBB1 .BY $5C,$2A,$3B,$13,$01,$3D,$5E,$2F
EBB9 .BY $31,$5F,$04,$32,$20,$02,$51,$03
EBC1 .BY $FF
; shift keyboard table
EBC2 .BY $94,$8D,$9D,$8C,$89,$8A,$8B,$91
EBCA .BY $23,$D7,$C1,$24,$DA,$D3,$C5,$01
EBD2 .BY $25,$D2,$C4,$26,$C3,$C6,$D4,$D8
EBDA .BY $27,$D9,$C7,$28,$C2,$C8,$D5,$D6
EBE2 .BY $29,$C9,$CA,$30,$CD,$CB,$CF,$CE
EBEA .BY $DB,$D0,$CC,$DD,$3E,$5B,$BA,$3C
EBF2 .BY $A9,$C0,$5D,$93,$01,$3D,$DE,$3F
EBFA .BY $21,$5F,$04,$22,$A0,$02,$D1,$83
EC02 .BY $FF
; commodore key keyboard table
EC03 .BY $94,$8D,$9D,$8C,$89,$8A,$8B,$91
EC0B .BY $96,$B3,$B0,$97,$AD,$AE,$B1,$01
EC13 .BY $98,$B2,$AC,$99,$BC,$BB,$A3,$BD
EC1B .BY $9A,$B7,$A5,$9B,$BF,$B4,$B8,$BE
EC23 .BY $29,$A2,$B5,$30,$A7,$A1,$B9,$AA
EC2B .BY $A6,$AF,$B6,$DC,$3E,$5B,$A4,$3C
EC33 .BY $A8,$DF,$5D,$93,$01,$3D,$DE,$3F
EC3B .BY $81,$5F,$04,$95,$A0,$02,$AB,$83
EC43 .BY $FF
; check for special petscii codes
EC44 C9 0E CMP #$0E
EC46 D0 07 BNE $EC4F
EC48 AD 18 D0 LDA $D018
EC4B 09 02 ORA #$02
EC4D D0 09 BNE $EC58
EC4F C9 8E CMP #$8E
EC51 D0 0B BNE $EC5E
EC53 AD 18 D0 LDA $D018
EC56 29 FD AND #$FD
EC58 8D 18 D0 STA $D018
EC5B 4C A8 E6 JMP $E6A8
; shift + commodore key check
EC5E C9 08 CMP #$08
EC60 D0 07 BNE $EC69
EC62 A9 80 LDA #$80
EC64 0D 91 02 ORA $0291
EC67 30 09 BMI $EC72
EC69 C9 09 CMP #$09
EC6B D0 EE BNE $EC5B
EC6D A9 7F LDA #$7F
EC6F 2D 91 02 AND $0291
EC72 8D 91 02 STA $0291
EC75 4C A8 E6 JMP $E6A8
; control keyboard table
EC78 .BY $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
EC80 .BY $1C,$17,$01,$9F,$1A,$13,$05,$FF
EC88 .BY $9C,$12,$04,$1E,$03,$06,$14,$18
EC90 .BY $1F,$19,$07,$9E,$02,$08,$15,$16
EC98 .BY $12,$09,$0A,$92,$0D,$0B,$0F,$0E
ECA0 .BY $FF,$10,$0C,$FF,$FF,$1B,$00,$FF
ECA8 .BY $1C,$FF,$1D,$FF,$FF,$1F,$1E,$FF
ECB0 .BY $90,$06,$FF,$05,$FF,$FF,$11,$FF
ECB8 .BY $FF
; default values for VIC chip
ECB9 .BY $00,$00 ; sprite 1 x,y
ECBB .BY $00,$00 ; sprite 2 x,y
ECBD .BY $00,$00 ; sprite 3 x,y
ECBF .BY $00,$00 ; sprite 4 x,y
ECC1 .BY $00,$00 ; sprite 5 x,y
ECC3 .BY $00,$00 ; sprite 6 x,y
ECC5 .BY $00,$00 ; sprite 7 x,y
ECC7 .BY $00,$00 ; sprite 8 x,y
ECC9 .BY $00
ECCA .BY $9B
ECCB .BY $37
ECCC .BY $00
ECCD .BY $00
ECCE .BY $00
ECCF .BY $08
ECD0 .BY $00 ; sprite Y expand
ECD1 .BY $14
ECD2 .BY $0F
ECD3 .BY $00
ECD4 .BY $00
ECD5 .BY $00 ; sprite multi-color
ECD6 .BY $00 ; sprite X expand
ECD7 .BY $00
ECD8 .BY $00
ECD9 .BY $0E ; boarder color
ECDA .BY $06 ; background color
ECDB .BY $01
ECDC .BY $02
ECDD .BY $03
ECDE .BY $04
ECDF .BY $00 ; sprite color
ECE0 .BY $01 ; sprite color
ECE1 .BY $02 ; sprite color
ECE2 .BY $03 ; sprite color
ECE3 .BY $04 ; sprite color
ECE4 .BY $05 ; sprite color
ECE5 .BY $06 ; sprite color
ECE6 .BY $07 ; sprite color
; load
ECE7 .BY $4C,$4F,$41,$44,$0D
; run
ECEC .BY $52,$55,$4E,$0D
; low bytes of screen line addresses
ECF0 .BY $00,$28,$50,$78,$A0
ECF5 .BY $C8,$F0,$18,$40,$68
ECFA .BY $90,$B8,$E0,$08,$30
ECFF .BY $58,$80,$A8,$D0,$F8
ED04 .BY $20,$48,$70,$98,$C0
; send talk on serial bus
ED09 09 40 ORA #$40
ED0B .BY $2C
; send listen on serial bus
ED0C 09 20 ORA #$20
ED0E 20 A4 F0 JSR $F0A4
ED11 48 PHA
ED12 24 94 BIT $94
ED14 10 0A BPL $ED20
ED16 38 SEC
ED17 66 A3 ROR $A3
ED19 20 40 ED JSR $ED40
ED1C 46 94 LSR $94
ED1E 46 A3 LSR $A3
ED20 68 PLA
ED21 85 95 STA $95
ED23 78 SEI
ED24 20 97 EE JSR $EE97
ED27 C9 3F CMP #$3F
ED29 D0 03 BNE $ED2E
ED2B 20 85 EE JSR $EE85
ED2E AD 00 DD LDA $DD00
ED31 09 08 ORA #$08
ED33 8D 00 DD STA $DD00
ED36 78 SEI
ED37 20 8E EE JSR $EE8E
ED3A 20 97 EE JSR $EE97
ED3D 20 B3 EE JSR $EEB3
; send byte from $95 on serial bus
ED40 78 SEI
ED41 20 97 EE JSR $EE97
ED44 20 A9 EE JSR $EEA9
ED47 B0 64 BCS $EDAD
ED49 20 85 EE JSR $EE85
ED4C 24 A3 BIT $A3
ED4E 10 0A BPL $ED5A
ED50 20 A9 EE JSR $EEA9
ED53 90 FB BCC $ED50
ED55 20 A9 EE JSR $EEA9
ED58 B0 FB BCS $ED55
ED5A 20 A9 EE JSR $EEA9
ED5D 90 FB BCC $ED5A
ED5F 20 8E EE JSR $EE8E
ED62 A9 08 LDA #$08
ED64 85 A5 STA $A5
ED66 AD 00 DD LDA $DD00
ED69 CD 00 DD CMP $DD00
ED6C D0 F8 BNE $ED66
ED6E 0A ASL
ED6F 90 3F BCC $EDB0
ED71 66 95 ROR $95
ED73 B0 05 BCS $ED7A
ED75 20 A0 EE JSR $EEA0
ED78 D0 03 BNE $ED7D
ED7A 20 97 EE JSR $EE97
ED7D 20 85 EE JSR $EE85
ED80 EA NOP
ED81 EA NOP
ED82 EA NOP
ED83 EA NOP
ED84 AD 00 DD LDA $DD00
ED87 29 DF AND #$DF
ED89 09 10 ORA #$10
ED8B 8D 00 DD STA $DD00
ED8E C6 A5 DEC $A5
ED90 D0 D4 BNE $ED66
ED92 A9 04 LDA #$04
ED94 8D 07 DC STA $DC07
ED97 A9 19 LDA #$19
ED99 8D 0F DC STA $DC0F
ED9C AD 0D DC LDA $DC0D
ED9F AD 0D DC LDA $DC0D
EDA2 29 02 AND #$02
EDA4 D0 0A BNE $EDB0
EDA6 20 A9 EE JSR $EEA9
EDA9 B0 F4 BCS $ED9F
EDAB 58 CLI
EDAC 60 RTS
EDAD A9 80 LDA #$80
EDAF .BY $2C
EDB0 A9 03 LDA #$03
EDB2 20 1C FE JSR $FE1C
EDB5 58 CLI
EDB6 18 CLC
EDB7 90 4A BCC $EE03
; send secondary address (listen) on serial bus
EDB9 85 95 STA $95
EDBB 20 36 ED JSR $ED36
EDBE AD 00 DD LDA $DD00
EDC1 29 F7 AND #$F7
EDC3 8D 00 DD STA $DD00
EDC6 60 RTS
; send secondary address (talk) on serial bus
EDC7 85 95 STA $95
EDC9 20 36 ED JSR $ED36
EDCC 78 SEI
EDCD 20 A0 EE JSR $EEA0
EDD0 20 BE ED JSR $EDBE
EDD3 20 85 EE JSR $EE85
EDD6 20 A9 EE JSR $EEA9
EDD9 30 FB BMI $EDD6
EDDB 58 CLI
EDDC 60 RTS
; output byte on serial bus
EDDD 24 94 BIT $94
EDDF 30 05 BMI $EDE6
EDE1 38 SEC
EDE2 66 94 ROR $94
EDE4 D0 05 BNE $EDEB
EDE6 48 PHA
EDE7 20 40 ED JSR $ED40
EDEA 68 PLA
EDEB 85 95 STA $95
EDED 18 CLC
EDEE 60 RTS
; send talk on serial bus
EDEF 78 SEI
EDF0 20 8E EE JSR $EE8E
EDF3 AD 00 DD LDA $DD00
EDF6 09 08 ORA #$08
EDF8 8D 00 DD STA $DD00
EDFB A9 5F LDA #$5F
EDFD .BY $2C
; send unlisten on serial bus
EDFE A9 3F LDA #$3F
EE00 20 11 ED JSR $ED11
EE03 20 BE ED JSR $EDBE
EE06 8A TXA
EE07 A2 0A LDX #$0A
EE09 CA DEX
EE0A D0 FD BNE $EE09
EE0C AA TAX
EE0D 20 85 EE JSR $EE85
EE10 4C 97 EE JMP $EE97
; input byte on serial bus
EE13 78 SEI
EE14 A9 00 LDA #$00
EE16 85 A5 STA $A5
EE18 20 85 EE JSR $EE85
EE1B 20 A9 EE JSR $EEA9
EE1E 10 FB BPL $EE1B
EE20 A9 01 LDA #$01
EE22 8D 07 DC STA $DC07
EE25 A9 19 LDA #$19
EE27 8D 0F DC STA $DC0F
EE2A 20 97 EE JSR $EE97
EE2D AD 0D DC LDA $DC0D
EE30 AD 0D DC LDA $DC0D
EE33 29 02 AND #$02
EE35 D0 07 BNE $EE3E
EE37 20 A9 EE JSR $EEA9
EE3A 30 F4 BMI $EE30
EE3C 10 18 BPL $EE56
EE3E A5 A5 LDA $A5
EE40 F0 05 BEQ $EE47
EE42 A9 02 LDA #$02
EE44 4C B2 ED JMP $EDB2
EE47 20 A0 EE JSR $EEA0
EE4A 20 85 EE JSR $EE85
EE4D A9 40 LDA #$40
EE4F 20 1C FE JSR $FE1C
EE52 E6 A5 INC $A5
EE54 D0 CA BNE $EE20
EE56 A9 08 LDA #$08
EE58 85 A5 STA $A5
EE5A AD 00 DD LDA $DD00
EE5D CD 00 DD CMP $DD00
EE60 D0 F8 BNE $EE5A
EE62 0A ASL
EE63 10 F5 BPL $EE5A
EE65 66 A4 ROR $A4
EE67 AD 00 DD LDA $DD00
EE6A CD 00 DD CMP $DD00
EE6D D0 F8 BNE $EE67
EE6F 0A ASL
EE70 30 F5 BMI $EE67
EE72 C6 A5 DEC $A5
EE74 D0 E4 BNE $EE5A
EE76 20 A0 EE JSR $EEA0
EE79 24 90 BIT $90
EE7B 50 03 BVC $EE80
EE7D 20 06 EE JSR $EE06
EE80 A5 A4 LDA $A4
EE82 58 CLI
EE83 18 CLC
EE84 60 RTS
; set serial clock line low
EE85 AD 00 DD LDA $DD00
EE88 29 EF AND #$EF
EE8A 8D 00 DD STA $DD00
EE8D 60 RTS
; set serial clock line high
EE8E AD 00 DD LDA $DD00
EE91 09 10 ORA #$10
EE93 8D 00 DD STA $DD00
EE96 60 RTS
; set serial data line low
EE97 AD 00 DD LDA $DD00
EE9A 29 DF AND #$DF
EE9C 8D 00 DD STA $DD00
EE9F 60 RTS
; set serial data line high
EEA0 AD 00 DD LDA $DD00
EEA3 09 20 ORA #$20
EEA5 8D 00 DD STA $DD00
EEA8 60 RTS
EEA9 AD 00 DD LDA $DD00
EEAC CD 00 DD CMP $DD00
EEAF D0 F8 BNE $EEA9
EEB1 0A ASL
EEB2 60 RTS
; delay 1 millisecond
EEB3 8A TXA
EEB4 A2 B8 LDX #$B8
EEB6 CA DEX
EEB7 D0 FD BNE $EEB6
EEB9 AA TAX
EEBA 60 RTS
; set next bit to transmit on RS-232
EEBB A5 B4 LDA $B4
EEBD F0 47 BEQ $EF06
EEBF 30 3F BMI $EF00
EEC1 46 B6 LSR $B6
EEC3 A2 00 LDX #$00
EEC5 90 01 BCC $EEC8
EEC7 CA DEX
EEC8 8A TXA
EEC9 45 BD EOR $BD
EECB 85 BD STA $BD
EECD C6 B4 DEC $B4
EECF F0 06 BEQ $EED7
EED1 8A TXA
EED2 29 04 AND #$04
EED4 85 B5 STA $B5
EED6 60 RTS
EED7 A9 20 LDA #$20
EED9 2C 94 02 BIT $0294
EEDC F0 14 BEQ $EEF2
EEDE 30 1C BMI $EEFC
EEE0 70 14 BVS $EEF6
EEE2 A5 BD LDA $BD
EEE4 D0 01 BNE $EEE7
EEE6 CA DEX
EEE7 C6 B4 DEC $B4
EEE9 AD 93 02 LDA $0293
EEEC 10 E3 BPL $EED1
EEEE C6 B4 DEC $B4
EEF0 D0 DF BNE $EED1
EEF2 E6 B4 INC $B4
EEF4 D0 F0 BNE $EEE6
EEF6 A5 BD LDA $BD
EEF8 F0 ED BEQ $EEE7
EEFA D0 EA BNE $EEE6
EEFC 70 E9 BVS $EEE7
EEFE 50 E6 BVC $EEE6
EF00 E6 B4 INC $B4
EF02 A2 FF LDX #$FF
EF04 D0 CB BNE $EED1
EF06 AD 94 02 LDA $0294
EF09 4A LSR
EF0A 90 07 BCC $EF13
EF0C 2C 01 DD BIT $DD01
EF0F 10 1D BPL $EF2E
EF11 50 1E BVC $EF31
EF13 A9 00 LDA #$00
EF15 85 BD STA $BD
EF17 85 B5 STA $B5
EF19 AE 98 02 LDX $0298
EF1C 86 B4 STX $B4
EF1E AC 9D 02 LDY $029D
EF21 CC 9E 02 CPY $029E
EF24 F0 13 BEQ $EF39
EF26 B1 F9 LDA ($F9),Y
EF28 85 B6 STA $B6
EF2A EE 9D 02 INC $029D
EF2D 60 RTS
; handle RS-232 errors
EF2E A9 40 LDA #$40
EF30 .BY $2C
EF31 A9 10 LDA #$10
EF33 0D 97 02 ORA $0297
EF36 8D 97 02 STA $0297
EF39 A9 01 LDA #$01
EF3B 8D 0D DD STA $DD0D
EF3E 4D A1 02 EOR $02A1
EF41 09 80 ORA #$80
EF43 8D A1 02 STA $02A1
EF46 8D 0D DD STA $DD0D
EF49 60 RTS
; check control register
EF4A A2 09 LDX #$09
EF4C A9 20 LDA #$20
EF4E 2C 93 02 BIT $0293
EF51 F0 01 BEQ $EF54
EF53 CA DEX
EF54 50 02 BVC $EF58
EF56 CA DEX
EF57 CA DEX
EF58 60 RTS
; add bit input on RS-232 bus to word being input
EF59 A6 A9 LDX $A9
EF5B D0 33 BNE $EF90
EF5D C6 A8 DEC $A8
EF5F F0 36 BEQ $EF97
EF61 30 0D BMI $EF70
EF63 A5 A7 LDA $A7
EF65 45 AB EOR $AB
EF67 85 AB STA $AB
EF69 46 A7 LSR $A7
EF6B 66 AA ROR $AA
EF6D 60 RTS
; handle end of word for RS-232 input
EF6E C6 A8 DEC $A8
EF70 A5 A7 LDA $A7
EF72 F0 67 BEQ $EFDB
EF74 AD 93 02 LDA $0293
EF77 0A ASL
EF78 A9 01 LDA #$01
EF7A 65 A8 ADC $A8
EF7C D0 EF BNE $EF6D
; enable byte reception
EF7E A9 90 LDA #$90
EF80 8D 0D DD STA $DD0D
EF83 0D A1 02 ORA $02A1
EF86 8D A1 02 STA $02A1
EF89 85 A9 STA $A9
EF8B A9 02 LDA #$02
EF8D 4C 3B EF JMP $EF3B
; receiver start bit test
EF90 A5 A7 LDA $A7
EF92 D0 EA BNE $EF7E
EF94 4C D3 E4 JMP $E4D3
; put received data into RS-232 buffer
EF97 AC 9B 02 LDY $029B
EF9A C8 INY
EF9B CC 9C 02 CPY $029C
EF9E F0 2A BEQ $EFCA
EFA0 8C 9B 02 STY $029B
EFA3 88 DEY
EFA4 A5 AA LDA $AA
EFA6 AE 98 02 LDX $0298
EFA9 E0 09 CPX #$09
EFAB F0 04 BEQ $EFB1
EFAD 4A LSR
EFAE E8 INX
EFAF D0 F8 BNE $EFA9
EFB1 91 F7 STA ($F7),Y
EFB3 A9 20 LDA #$20
EFB5 2C 94 02 BIT $0294
EFB8 F0 B4 BEQ $EF6E
EFBA 30 B1 BMI $EF6D
EFBC A5 A7 LDA $A7
EFBE 45 AB EOR $AB
EFC0 F0 03 BEQ $EFC5
EFC2 70 A9 BVS $EF6D
EFC4 .BY $2C
EFC5 50 A6 BVC $EF6D
EFC7 A9 01 LDA #$01
EFC9 .BY $2C
EFCA A9 04 LDA #$04
EFCC .BY $2C
EFCD A9 80 LDA #$80
EFCF .BY $2C
EFD0 A9 02 LDA #$02
EFD2 0D 97 02 ORA $0297
EFD5 8D 97 02 STA $0297
EFD8 4C 7E EF JMP $EF7E
EFDB A5 AA LDA $AA
EFDD D0 F1 BNE $EFD0
EFDF F0 EC BEQ $EFCD
; output of RS-232 device
EFE1 85 9A STA $9A
EFE3 AD 94 02 LDA $0294
EFE6 4A LSR
EFE7 90 29 BCC $F012
EFE9 A9 02 LDA #$02
EFEB 2C 01 DD BIT $DD01
EFEE 10 1D BPL $F00D
EFF0 D0 20 BNE $F012
EFF2 AD A1 02 LDA $02A1
EFF5 29 02 AND #$02
EFF7 D0 F9 BNE $EFF2
EFF9 2C 01 DD BIT $DD01
EFFC 70 FB BVS $EFF9
EFFE AD 01 DD LDA $DD01
F001 09 02 ORA #$02
F003 8D 01 DD STA $DD01
F006 2C 01 DD BIT $DD01
F009 70 07 BVS $F012
F00B 30 F9 BMI $F006
F00D A9 40 LDA #$40
F00F 8D 97 02 STA $0297
F012 18 CLC
F013 60 RTS
; buffer char to output on RS-232
F014 20 28 F0 JSR $F028
F017 AC 9E 02 LDY $029E
F01A C8 INY
F01B CC 9D 02 CPY $029D
F01E F0 F4 BEQ $F014
F020 8C 9E 02 STY $029E
F023 88 DEY
F024 A5 9E LDA $9E
F026 91 F9 STA ($F9),Y
F028 AD A1 02 LDA $02A1
F02B 4A LSR
F02C B0 1E BCS $F04C
F02E A9 10 LDA #$10
F030 8D 0E DD STA $DD0E
F033 AD 99 02 LDA $0299
F036 8D 04 DD STA $DD04
F039 AD 9A 02 LDA $029A
F03C 8D 05 DD STA $DD05
F03F A9 81 LDA #$81
F041 20 3B EF JSR $EF3B
F044 20 06 EF JSR $EF06
F047 A9 11 LDA #$11
F049 8D 0E DD STA $DD0E
F04C 60 RTS
; initalise RS-232 input
F04D 85 99 STA $99
F04F AD 94 02 LDA $0294
F052 4A LSR
F053 90 28 BCC $F07D
F055 29 08 AND #$08
F057 F0 24 BEQ $F07D
F059 A9 02 LDA #$02
F05B 2C 01 DD BIT $DD01
F05E 10 AD BPL $F00D
F060 F0 22 BEQ $F084
F062 AD A1 02 LDA $02A1
F065 4A LSR
F066 B0 FA BCS $F062
F068 AD 01 DD LDA $DD01
F06B 29 FD AND #$FD
F06D 8D 01 DD STA $DD01
F070 AD 01 DD LDA $DD01
F073 29 04 AND #$04
F075 F0 F9 BEQ $F070
F077 A9 90 LDA #$90
F079 18 CLC
F07A 4C 3B EF JMP $EF3B
F07D AD A1 02 LDA $02A1
F080 29 12 AND #$12
F082 F0 F3 BEQ $F077
F084 18 CLC
F085 60 RTS
; get next character from RS-232 input buffer
F086 AD 97 02 LDA $0297
F089 AC 9C 02 LDY $029C
F08C CC 9B 02 CPY $029B
F08F F0 0B BEQ $F09C
F091 29 F7 AND #$F7
F093 8D 97 02 STA $0297
F096 B1 F7 LDA ($F7),Y
F098 EE 9C 02 INC $029C
F09B 60 RTS
F09C 09 08 ORA #$08
F09E 8D 97 02 STA $0297
F0A1 A9 00 LDA #$00
F0A3 60 RTS
; protect serial/casette routine from RS-232 NMI's
F0A4 48 PHA
F0A5 AD A1 02 LDA $02A1
F0A8 F0 11 BEQ $F0BB
F0AA AD A1 02 LDA $02A1
F0AD 29 03 AND #$03
F0AF D0 F9 BNE $F0AA
F0B1 A9 10 LDA #$10
F0B3 8D 0D DD STA $DD0D
F0B6 A9 00 LDA #$00
F0B8 8D A1 02 STA $02A1
F0BB 68 PLA
F0BC 60 RTS
; kernal I/O messages
F0BD .BY $0D ; I/O error
F0BE .BY $49,$2F,$4F
F0C1 .BY $20,$45,$52,$52,$4F,$52
F0C7 .BY $20,$A3
F0C9 .BY $0D ; searching for
F0CA .BY $53,$45,$41,$52,$43,
F0CF .BY $48,$49,$4E,$47,$A0
F0D4 .BY $46,$4F,$52,$A0
F0D8 .BY $0D ; press play on tape
F0D9 .BY $50,$52,$45,$53,$53
F0DE .BY $20,$50,$4C,$41,$59
F0E3 .BY $20,$4F,$4E
F0E6 .BY $20,$54,$41,$50,$C5
F0EB .BY $50,$52,$45,$53,$53 ; press record and play on tape
F0F0 .BY $20,$52,$45,$43,
F0F4 .BY $4F,$52,$44
F0F7 .BY $20,$26
F0F9 .BY $20,$50,$4C,$41,$59
F0FE .BY $20,$4F,$4E
F101 .BY $20,$54,$41,$50,$C5
F106 .BY $0D ; loading
F107 .BY $4C,$4F,$41,$44,
F10B .BY $49,$4E,$C7
F10E .BY $0D ; saving
F10F .BY $53,$41,$56,$49,
F113 .BY $4E,$47,$A0
F116 .BY $0D ; verifying
F117 .BY $56,$45,$52,$49,$46,
F11C .BY $59,$49,$4E,$C7
F120 .BY $0D ; found
F121 .BY $46,$4F,$55,$4E,$44,$A0
F127 .BY $0D ; ok
F128 .BY $4F,$4B,$8D
; print kernal message indexed by Y
F12B 24 9D BIT $9D
F12D 10 0D BPL $F13C
F12F B9 BD F0 LDA $F0BD,Y
F132 08 PHP
F133 29 7F AND #$7F
F135 20 D2 FF JSR $FFD2
F138 C8 INY
F139 28 PLP
F13A 10 F3 BPL $F12F
F13C 18 CLC
F13D 60 RTS
; get a character
F13E A5 99 LDA $99
F140 D0 08 BNE $F14A
F142 A5 C6 LDA $C6
F144 F0 0F BEQ $F155
F146 78 SEI
F147 4C B4 E5 JMP $E5B4
F14A C9 02 CMP #$02
F14C D0 18 BNE $F166
F14E 84 97 STY $97
F150 20 86 F0 JSR $F086
F153 A4 97 LDY $97
F155 18 CLC
F156 60 RTS
; input a character
F157 A5 99 LDA $99
F159 D0 0B BNE $F166
F15B A5 D3 LDA $D3
F15D 85 CA STA $CA
F15F A5 D6 LDA $D6
F161 85 C9 STA $C9
F163 4C 32 E6 JMP $E632
F166 C9 03 CMP #$03
F168 D0 09 BNE $F173
F16A 85 D0 STA $D0
F16C A5 D5 LDA $D5
F16E 85 C8 STA $C8
F170 4C 32 E6 JMP $E632
F173 B0 38 BCS $F1AD
F175 C9 02 CMP #$02
F177 F0 3F BEQ $F1B8
F179 86 97 STX $97
F17B 20 99 F1 JSR $F199
F17E B0 16 BCS $F196
F180 48 PHA
F181 20 99 F1 JSR $F199
F184 B0 0D BCS $F193
F186 D0 05 BNE $F18D
F188 A9 40 LDA #$40
F18A 20 1C FE JSR $FE1C
F18D C6 A6 DEC $A6
F18F A6 97 LDX $97
F191 68 PLA
F192 60 RTS
F193 AA TAX
F194 68 PLA
F195 8A TXA
F196 A6 97 LDX $97
F198 60 RTS
; read a byte from cassette buffer
F199 20 0D F8 JSR $F80D
F19C D0 0B BNE $F1A9
F19E 20 41 F8 JSR $F841
F1A1 B0 11 BCS $F1B4
F1A3 A9 00 LDA #$00
F1A5 85 A6 STA $A6
F1A7 F0 F0 BEQ $F199
F1A9 B1 B2 LDA ($B2),Y
F1AB 18 CLC
F1AC 60 RTS
F1AD A5 90 LDA $90
F1AF F0 04 BEQ $F1B5
F1B1 A9 0D LDA #$0D
F1B3 18 CLC
F1B4 60 RTS
; read a byte from serial bus
F1B5 4C 13 EE JMP $EE13
; read a byte from RS-232 bus
F1B8 20 4E F1 JSR $F14E
F1BB B0 F7 BCS $F1B4
F1BD C9 00 CMP #$00
F1BF D0 F2 BNE $F1B3
F1C1 AD 97 02 LDA $0297
F1C4 29 60 AND #$60
F1C6 D0 E9 BNE $F1B1
F1C8 F0 EE BEQ $F1B8
; output a character
F1CA 48 PHA
F1CB A5 9A LDA $9A
F1CD C9 03 CMP #$03
F1CF D0 04 BNE $F1D5
F1D1 68 PLA
F1D2 4C 16 E7 JMP $E716
F1D5 90 04 BCC $F1DB
F1D7 68 PLA
F1D8 4C DD ED JMP $EDDD
F1DB 4A LSR
F1DC 68 PLA
F1DD 85 9E STA $9E
F1DF 8A TXA
F1E0 48 PHA
F1E1 98 TYA
F1E2 48 PHA
F1E3 90 23 BCC $F208
F1E5 20 0D F8 JSR $F80D
F1E8 D0 0E BNE $F1F8
F1EA 20 64 F8 JSR $F864
F1ED B0 0E BCS $F1FD
F1EF A9 02 LDA #$02
F1F1 A0 00 LDY #$00
F1F3 91 B2 STA ($B2),Y
F1F5 C8 INY
F1F6 84 A6 STY $A6
F1F8 A5 9E LDA $9E
F1FA 91 B2 STA ($B2),Y
F1FC 18 CLC
F1FD 68 PLA
F1FE A8 TAY
F1FF 68 PLA
F200 AA TAX
F201 A5 9E LDA $9E
F203 90 02 BCC $F207
F205 A9 00 LDA #$00
F207 60 RTS
F208 20 17 F0 JSR $F017
F20B 4C FC F1 JMP $F1FC
; set input device
F20E 20 0F F3 JSR $F30F
F211 F0 03 BEQ $F216
F213 4C 01 F7 JMP $F701
F216 20 1F F3 JSR $F31F
F219 A5 BA LDA $BA
F21B F0 16 BEQ $F233
F21D C9 03 CMP #$03
F21F F0 12 BEQ $F233
F221 B0 14 BCS $F237
F223 C9 02 CMP #$02
F225 D0 03 BNE $F22A
F227 4C 4D F0 JMP $F04D
F22A A6 B9 LDX $B9
F22C E0 60 CPX #$60
F22E F0 03 BEQ $F233
F230 4C 0A F7 JMP $F70A
F233 85 99 STA $99
F235 18 CLC
F236 60 RTS
; set serial bus input device
F237 AA TAX
F238 20 09 ED JSR $ED09
F23B A5 B9 LDA $B9
F23D 10 06 BPL $F245
F23F 20 CC ED JSR $EDCC
F242 4C 48 F2 JMP $F248
F245 20 C7 ED JSR $EDC7
F248 8A TXA
F249 24 90 BIT $90
F24B 10 E6 BPL $F233
F24D 4C 07 F7 JMP $F707
; set output device
F250 20 0F F3 JSR $F30F
F253 F0 03 BEQ $F258
F255 4C 01 F7 JMP $F701
F258 20 1F F3 JSR $F31F
F25B A5 BA LDA $BA
F25D D0 03 BNE $F262
F25F 4C 0D F7 JMP $F70D
F262 C9 03 CMP #$03
F264 F0 0F BEQ $F275
F266 B0 11 BCS $F279
F268 C9 02 CMP #$02
F26A D0 03 BNE $F26F
F26C 4C E1 EF JMP $EFE1
F26F A6 B9 LDX $B9
F271 E0 60 CPX #$60
F273 F0 EA BEQ $F25F
F275 85 9A STA $9A
F277 18 CLC
F278 60 RTS
; set serial bus output device
F279 AA TAX
F27A 20 0C ED JSR $ED0C
F27D A5 B9 LDA $B9
F27F 10 05 BPL $F286
F281 20 BE ED JSR $EDBE
F284 D0 03 BNE $F289
F286 20 B9 ED JSR $EDB9
F289 8A TXA
F28A 24 90 BIT $90
F28C 10 E7 BPL $F275
F28E 4C 07 F7 JMP $F707
; close a file
F291 20 14 F3 JSR $F314
F294 F0 02 BEQ $F298
F296 18 CLC
F297 60 RTS
F298 20 1F F3 JSR $F31F
F29B 8A TXA
F29C 48 PHA
F29D A5 BA LDA $BA
F29F F0 50 BEQ $F2F1
F2A1 C9 03 CMP #$03
F2A3 F0 4C BEQ $F2F1
F2A5 B0 47 BCS $F2EE
F2A7 C9 02 CMP #$02
F2A9 D0 1D BNE $F2C8
F2AB 68 PLA
F2AC 20 F2 F2 JSR $F2F2
F2AF 20 83 F4 JSR $F483
F2B2 20 27 FE JSR $FE27
F2B5 A5 F8 LDA $F8
F2B7 F0 01 BEQ $F2BA
F2B9 C8 INY
F2BA A5 FA LDA $FA
F2BC F0 01 BEQ $F2BF
F2BE C8 INY
F2BF A9 00 LDA #$00
F2C1 85 F8 STA $F8
F2C3 85 FA STA $FA
F2C5 4C 7D F4 JMP $F47D
; close cassette device
F2C8 A5 B9 LDA $B9
F2CA 29 0F AND #$0F
F2CC F0 23 BEQ $F2F1
F2CE 20 D0 F7 JSR $F7D0
F2D1 A9 00 LDA #$00
F2D3 38 SEC
F2D4 20 DD F1 JSR $F1DD
F2D7 20 64 F8 JSR $F864
F2DA 90 04 BCC $F2E0
F2DC 68 PLA
F2DD A9 00 LDA #$00
F2DF 60 RTS
F2E0 A5 B9 LDA $B9
F2E2 C9 62 CMP #$62
F2E4 D0 0B BNE $F2F1
F2E6 A9 05 LDA #$05
F2E8 20 6A F7 JSR $F76A
F2EB 4C F1 F2 JMP $F2F1
; close serial bus device
F2EE 20 42 F6 JSR $F642
F2F1 68 PLA
; reorganise file tables
F2F2 AA TAX
F2F3 C6 98 DEC $98
F2F5 E4 98 CPX $98
F2F7 F0 14 BEQ $F30D
F2F9 A4 98 LDY $98
F2FB B9 59 02 LDA $0259,Y
F2FE 9D 59 02 STA $0259,X
F301 B9 63 02 LDA $0263,Y
F304 9D 63 02 STA $0263,X
F307 B9 6D 02 LDA $026D,Y
F30A 9D 6D 02 STA $026D,X
F30D 18 CLC
F30E 60 RTS
; check X against logical file table
F30F A9 00 LDA #$00
F311 85 90 STA $90
F313 8A TXA
F314 A6 98 LDX $98
F316 CA DEX
F317 30 15 BMI $F32E
F319 DD 59 02 CMP $0259,X
F31C D0 F8 BNE $F316
F31E 60 RTS
; set file parameters depending on X
F31F BD 59 02 LDA $0259,X
F322 85 B8 STA $B8
F324 BD 63 02 LDA $0263,X
F327 85 BA STA $BA
F329 BD 6D 02 LDA $026D,X
F32C 85 B9 STA $B9
F32E 60 RTS
; close all files
F32F A9 00 LDA #$00
F331 85 98 STA $98
; restore I/O to default devices
F333 A2 03 LDX #$03
F335 E4 9A CPX $9A
F337 B0 03 BCS $F33C
F339 20 FE ED JSR $EDFE
F33C E4 99 CPX $99
F33E B0 03 BCS $F343
F340 20 EF ED JSR $EDEF
F343 86 9A STX $9A
F345 A9 00 LDA #$00
F347 85 99 STA $99
F349 60 RTS
; open a file
F34A A6 B8 LDX $B8
F34C D0 03 BNE $F351
F34E 4C 0A F7 JMP $F70A
F351 20 0F F3 JSR $F30F
F354 D0 03 BNE $F359
F356 4C FE F6 JMP $F6FE
F359 A6 98 LDX $98
F35B E0 0A CPX #$0A
F35D 90 03 BCC $F362
F35F 4C FB F6 JMP $F6FB
F362 E6 98 INC $98
F364 A5 B8 LDA $B8
F366 9D 59 02 STA $0259,X
F369 A5 B9 LDA $B9
F36B 09 60 ORA #$60
F36D 85 B9 STA $B9
F36F 9D 6D 02 STA $026D,X
F372 A5 BA LDA $BA
F374 9D 63 02 STA $0263,X
F377 F0 5A BEQ $F3D3
F379 C9 03 CMP #$03
F37B F0 56 BEQ $F3D3
F37D 90 05 BCC $F384
F37F 20 D5 F3 JSR $F3D5
F382 90 4F BCC $F3D3
F384 C9 02 CMP #$02
F386 D0 03 BNE $F38B
F388 4C 09 F4 JMP $F409
; open for cassette device
F38B 20 D0 F7 JSR $F7D0
F38E B0 03 BCS $F393
F390 4C 13 F7 JMP $F713
F393 A5 B9 LDA $B9
F395 29 0F AND #$0F
F397 D0 1F BNE $F3B8
F399 20 17 F8 JSR $F817
F39C B0 36 BCS $F3D4
F39E 20 AF F5 JSR $F5AF
F3A1 A5 B7 LDA $B7
F3A3 F0 0A BEQ $F3AF
F3A5 20 EA F7 JSR $F7EA
F3A8 90 18 BCC $F3C2
F3AA F0 28 BEQ $F3D4
F3AC 4C 04 F7 JMP $F704
F3AF 20 2C F7 JSR $F72C
F3B2 F0 20 BEQ $F3D4
F3B4 90 0C BCC $F3C2
F3B6 B0 F4 BCS $F3AC
; open cassette for input
F3B8 20 38 F8 JSR $F838
F3BB B0 17 BCS $F3D4
F3BD A9 04 LDA #$04
F3BF 20 6A F7 JSR $F76A
F3C2 A9 BF LDA #$BF
F3C4 A4 B9 LDY $B9
F3C6 C0 60 CPY #$60
F3C8 F0 07 BEQ $F3D1
F3CA A0 00 LDY #$00
F3CC A9 02 LDA #$02
F3CE 91 B2 STA ($B2),Y
F3D0 98 TYA
F3D1 85 A6 STA $A6
F3D3 18 CLC
F3D4 60 RTS
; open for serial bus devices
F3D5 A5 B9 LDA $B9
F3D7 30 FA BMI $F3D3
F3D9 A4 B7 LDY $B7
F3DB F0 F6 BEQ $F3D3
F3DD A9 00 LDA #$00
F3DF 85 90 STA $90
F3E1 A5 BA LDA $BA
F3E3 20 0C ED JSR $ED0C
F3E6 A5 B9 LDA $B9
F3E8 09 F0 ORA #$F0
F3EA 20 B9 ED JSR $EDB9
F3ED A5 90 LDA $90
F3EF 10 05 BPL $F3F6
F3F1 68 PLA
F3F2 68 PLA
F3F3 4C 07 F7 JMP $F707
F3F6 A5 B7 LDA $B7
F3F8 F0 0C BEQ $F406
F3FA A0 00 LDY #$00
F3FC B1 BB LDA ($BB),Y
F3FE 20 DD ED JSR $EDDD
F401 C8 INY
F402 C4 B7 CPY $B7
F404 D0 F6 BNE $F3FC
F406 4C 54 F6 JMP $F654
; open RS-232 device
F409 20 83 F4 JSR $F483
F40C 8C 97 02 STY $0297
F40F C4 B7 CPY $B7
F411 F0 0A BEQ $F41D
F413 B1 BB LDA ($BB),Y
F415 99 93 02 STA $0293,Y
F418 C8 INY
F419 C0 04 CPY #$04
F41B D0 F2 BNE $F40F
F41D 20 4A EF JSR $EF4A
F420 8E 98 02 STX $0298
F423 AD 93 02 LDA $0293
F426 29 0F AND #$0F
F428 F0 1C BEQ $F446
F42A 0A ASL
F42B AA TAX
F42C AD A6 02 LDA $02A6
F42F D0 09 BNE $F43A
F431 BC C1 FE LDY $FEC1,X
F434 BD C0 FE LDA $FEC0,X
F437 4C 40 F4 JMP $F440
F43A BC EB E4 LDY $E4EB,X
F43D BD EA E4 LDA $E4EA,X
F440 8C 96 02 STY $0296
F443 8D 95 02 STA $0295
F446 AD 95 02 LDA $0295
F449 0A ASL
F44A 20 2E FF JSR $FF2E
F44D AD 94 02 LDA $0294
F450 4A LSR
F451 90 09 BCC $F45C
F453 AD 01 DD LDA $DD01
F456 0A ASL
F457 B0 03 BCS $F45C
F459 20 0D F0 JSR $F00D
F45C AD 9B 02 LDA $029B
F45F 8D 9C 02 STA $029C
F462 AD 9E 02 LDA $029E
F465 8D 9D 02 STA $029D
F468 20 27 FE JSR $FE27
F46B A5 F8 LDA $F8
F46D D0 05 BNE $F474
F46F 88 DEY
F470 84 F8 STY $F8
F472 86 F7 STX $F7
F474 A5 FA LDA $FA
F476 D0 05 BNE $F47D
F478 88 DEY
F479 84 FA STY $FA
F47B 86 F9 STX $F9
F47D 38 SEC
F47E A9 F0 LDA #$F0
F480 4C 2D FE JMP $FE2D
; initialise CIA 2
F483 A9 7F LDA #$7F
F485 8D 0D DD STA $DD0D
F488 A9 06 LDA #$06
F48A 8D 03 DD STA $DD03
F48D 8D 01 DD STA $DD01
F490 A9 04 LDA #$04
F492 0D 00 DD ORA $DD00
F495 8D 00 DD STA $DD00
F498 A0 00 LDY #$00
F49A 8C A1 02 STY $02A1
F49D 60 RTS
; load ram from a device
F49E 86 C3 STX $C3
F4A0 84 C4 STY $C4
F4A2 6C 30 03 JMP ($0330) ; normally F4A5
; standard load ram entry
F4A5 85 93 STA $93
F4A7 A9 00 LDA #$00
F4A9 85 90 STA $90
F4AB A5 BA LDA $BA
F4AD D0 03 BNE $F4B2
F4AF 4C 13 F7 JMP $F713
F4B2 C9 03 CMP #$03
F4B4 F0 F9 BEQ $F4AF
F4B6 90 7B BCC $F533
F4B8 A4 B7 LDY $B7
F4BA D0 03 BNE $F4BF
F4BC 4C 10 F7 JMP $F710
F4BF A6 B9 LDX $B9
F4C1 20 AF F5 JSR $F5AF
F4C4 A9 60 LDA #$60
F4C6 85 B9 STA $B9
F4C8 20 D5 F3 JSR $F3D5
F4CB A5 BA LDA $BA
F4CD 20 09 ED JSR $ED09
F4D0 A5 B9 LDA $B9
F4D2 20 C7 ED JSR $EDC7
F4D5 20 13 EE JSR $EE13
F4D8 85 AE STA $AE
F4DA A5 90 LDA $90
F4DC 4A LSR
F4DD 4A LSR
F4DE B0 50 BCS $F530
F4E0 20 13 EE JSR $EE13
F4E3 85 AF STA $AF
F4E5 8A TXA
F4E6 D0 08 BNE $F4F0
F4E8 A5 C3 LDA $C3
F4EA 85 AE STA $AE
F4EC A5 C4 LDA $C4
F4EE 85 AF STA $AF
F4F0 20 D2 F5 JSR $F5D2
F4F3 A9 FD LDA #$FD
F4F5 25 90 AND $90
F4F7 85 90 STA $90
F4F9 20 E1 FF JSR $FFE1
F4FC D0 03 BNE $F501
F4FE 4C 33 F6 JMP $F633
F501 20 13 EE JSR $EE13
F504 AA TAX
F505 A5 90 LDA $90
F507 4A LSR
F508 4A LSR
F509 B0 E8 BCS $F4F3
F50B 8A TXA
F50C A4 93 LDY $93
F50E F0 0C BEQ $F51C
F510 A0 00 LDY #$00
F512 D1 AE CMP ($AE),Y
F514 F0 08 BEQ $F51E
F516 A9 10 LDA #$10
F518 20 1C FE JSR $FE1C
F51B .BY $2C
F51C 91 AE STA ($AE),Y
F51E E6 AE INC $AE
F520 D0 02 BNE $F524
F522 E6 AF INC $AF
F524 24 90 BIT $90
F526 50 CB BVC $F4F3
F528 20 EF ED JSR $EDEF
F52B 20 42 F6 JSR $F642
F52E 90 79 BCC $F5A9
F530 4C 04 F7 JMP $F704
F533 4A LSR
F534 B0 03 BCS $F539
F536 4C 13 F7 JMP $F713
F539 20 D0 F7 JSR $F7D0
F53C B0 03 BCS $F541
F53E 4C 13 F7 JMP $F713
F541 20 17 F8 JSR $F817
F544 B0 68 BCS $F5AE
F546 20 AF F5 JSR $F5AF
F549 A5 B7 LDA $B7
F54B F0 09 BEQ $F556
F54D 20 EA F7 JSR $F7EA
F550 90 0B BCC $F55D
F552 F0 5A BEQ $F5AE
F554 B0 DA BCS $F530
F556 20 2C F7 JSR $F72C
F559 F0 53 BEQ $F5AE
F55B B0 D3 BCS $F530
F55D A5 90 LDA $90
F55F 29 10 AND #$10
F561 38 SEC
F562 D0 4A BNE $F5AE
F564 E0 01 CPX #$01
F566 F0 11 BEQ $F579
F568 E0 03 CPX #$03
F56A D0 DD BNE $F549
F56C A0 01 LDY #$01
F56E B1 B2 LDA ($B2),Y
F570 85 C3 STA $C3
F572 C8 INY
F573 B1 B2 LDA ($B2),Y
F575 85 C4 STA $C4
F577 B0 04 BCS $F57D
F579 A5 B9 LDA $B9
F57B D0 EF BNE $F56C
F57D A0 03 LDY #$03
F57F B1 B2 LDA ($B2),Y
F581 A0 01 LDY #$01
F583 F1 B2 SBC ($B2),Y
F585 AA TAX
F586 A0 04 LDY #$04
F588 B1 B2 LDA ($B2),Y
F58A A0 02 LDY #$02
F58C F1 B2 SBC ($B2),Y
F58E A8 TAY
F58F 18 CLC
F590 8A TXA
F591 65 C3 ADC $C3
F593 85 AE STA $AE
F595 98 TYA
F596 65 C4 ADC $C4
F598 85 AF STA $AF
F59A A5 C3 LDA $C3
F59C 85 C1 STA $C1
F59E A5 C4 LDA $C4
F5A0 85 C2 STA $C2
F5A2 20 D2 F5 JSR $F5D2
F5A5 20 4A F8 JSR $F84A
F5A8 .BY $24
F5A9 18 CLC
F5AA A6 AE LDX $AE
F5AC A4 AF LDY $AF
F5AE 60 RTS
; handle messages for loading
F5AF A5 9D LDA $9D
F5B1 10 1E BPL $F5D1
F5B3 A0 0C LDY #$0C
F5B5 20 2F F1 JSR $F12F
F5B8 A5 B7 LDA $B7
F5BA F0 15 BEQ $F5D1
F5BC A0 17 LDY #$17
F5BE 20 2F F1 JSR $F12F
F5C1 A4 B7 LDY $B7
F5C3 F0 0C BEQ $F5D1
F5C5 A0 00 LDY #$00
F5C7 B1 BB LDA ($BB),Y
F5C9 20 D2 FF JSR $FFD2
F5CC C8 INY
F5CD C4 B7 CPY $B7
F5CF D0 F6 BNE $F5C7
F5D1 60 RTS
; do load/verify message
F5D2 A0 49 LDY #$49
F5D4 A5 93 LDA $93
F5D6 F0 02 BEQ $F5DA
F5D8 A0 59 LDY #$59
F5DA 4C 2B F1 JMP $F12B
; save ram to a device
F5DD 86 AE STX $AE
F5DF 84 AF STY $AF
F5E1 AA TAX
F5E2 B5 00 LDA $00,X
F5E4 85 C1 STA $C1
F5E6 B5 01 LDA $01,X
F5E8 85 C2 STA $C2
F5EA 6C 32 03 JMP ($0332) ; normally F5ED
; standard save ram entry
F5ED A5 BA LDA $BA
F5EF D0 03 BNE $F5F4
F5F1 4C 13 F7 JMP $F713
F5F4 C9 03 CMP #$03
F5F6 F0 F9 BEQ $F5F1
F5F8 90 5F BCC $F659
F5FA A9 61 LDA #$61
F5FC 85 B9 STA $B9
F5FE A4 B7 LDY $B7
F600 D0 03 BNE $F605
F602 4C 10 F7 JMP $F710
F605 20 D5 F3 JSR $F3D5
F608 20 8F F6 JSR $F68F
F60B A5 BA LDA $BA
F60D 20 0C ED JSR $ED0C
F610 A5 B9 LDA $B9
F612 20 B9 ED JSR $EDB9
F615 A0 00 LDY #$00
F617 20 8E FB JSR $FB8E
F61A A5 AC LDA $AC
F61C 20 DD ED JSR $EDDD
F61F A5 AD LDA $AD
F621 20 DD ED JSR $EDDD
F624 20 D1 FC JSR $FCD1
F627 B0 16 BCS $F63F
F629 B1 AC LDA ($AC),Y
F62B 20 DD ED JSR $EDDD
F62E 20 E1 FF JSR $FFE1
F631 D0 07 BNE $F63A
F633 20 42 F6 JSR $F642
F636 A9 00 LDA #$00
F638 38 SEC
F639 60 RTS
F63A 20 DB FC JSR $FCDB
F63D D0 E5 BNE $F624
F63F 20 FE ED JSR $EDFE
; close serial bus device
F642 24 B9 BIT $B9
F644 30 11 BMI $F657
F646 A5 BA LDA $BA
F648 20 0C ED JSR $ED0C
F64B A5 B9 LDA $B9
F64D 29 EF AND #$EF
F64F 09 E0 ORA #$E0
F651 20 B9 ED JSR $EDB9
F654 20 FE ED JSR $EDFE
F657 18 CLC
F658 60 RTS
F659 4A LSR
F65A B0 03 BCS $F65F
F65C 4C 13 F7 JMP $F713
; save ram to cassette
F65F 20 D0 F7 JSR $F7D0
F662 90 8D BCC $F5F1
F664 20 38 F8 JSR $F838
F667 B0 25 BCS $F68E
F669 20 8F F6 JSR $F68F
F66C A2 03 LDX #$03
F66E A5 B9 LDA $B9
F670 29 01 AND #$01
F672 D0 02 BNE $F676
F674 A2 01 LDX #$01
F676 8A TXA
F677 20 6A F7 JSR $F76A
F67A B0 12 BCS $F68E
F67C 20 67 F8 JSR $F867
F67F B0 0D BCS $F68E
F681 A5 B9 LDA $B9
F683 29 02 AND #$02
F685 F0 06 BEQ $F68D
F687 A9 05 LDA #$05
F689 20 6A F7 JSR $F76A
F68C .BY $24
F68D 18 CLC
F68E 60 RTS
; do saving message and filename
F68F A5 9D LDA $9D
F691 10 FB BPL $F68E
F693 A0 51 LDY #$51
F695 20 2F F1 JSR $F12F
F698 4C C1 F5 JMP $F5C1
; increment real time clock
F69B A2 00 LDX #$00
F69D E6 A2 INC $A2
F69F D0 06 BNE $F6A7
F6A1 E6 A1 INC $A1
F6A3 D0 02 BNE $F6A7
F6A5 E6 A0 INC $A0
F6A7 38 SEC
F6A8 A5 A2 LDA $A2
F6AA E9 01 SBC #$01
F6AC A5 A1 LDA $A1
F6AE E9 1A SBC #$1A
F6B0 A5 A0 LDA $A0
F6B2 E9 4F SBC #$4F
F6B4 90 06 BCC $F6BC
F6B6 86 A0 STX $A0
F6B8 86 A1 STX $A1
F6BA 86 A2 STX $A2
F6BC AD 01 DC LDA $DC01
F6BF CD 01 DC CMP $DC01
F6C2 D0 F8 BNE $F6BC
F6C4 AA TAX
F6C5 30 13 BMI $F6DA
F6C7 A2 BD LDX #$BD
F6C9 8E 00 DC STX $DC00
F6CC AE 01 DC LDX $DC01
F6CF EC 01 DC CPX $DC01
F6D2 D0 F8 BNE $F6CC
F6D4 8D 00 DC STA $DC00
F6D7 E8 INX
F6D8 D0 02 BNE $F6DC
F6DA 85 91 STA $91
F6DC 60 RTS
; read real time clock
F6DD 78 SEI
F6DE A5 A2 LDA $A2
F6E0 A6 A1 LDX $A1
F6E2 A4 A0 LDY $A0
; set real time clock
F6E4 78 SEI
F6E5 85 A2 STA $A2
F6E7 86 A1 STX $A1
F6E9 84 A0 STY $A0
F6EB 58 CLI
F6EC 60 RTS
; test STOP key
F6ED A5 91 LDA $91
F6EF C9 7F CMP #$7F
F6F1 D0 07 BNE $F6FA
F6F3 08 PHP
F6F4 20 CC FF JSR $FFCC
F6F7 85 C6 STA $C6
F6F9 28 PLP
F6FA 60 RTS
; handle I/O errors
F6FB A9 01 LDA #$01 ; too many files
F6FD .BY $2C
F6FE A9 02 LDA #$02 ; file open
F700 .BY $2C
F701 A9 03 LDA #$03 ; file not open
F703 .BY $2C
F704 A9 04 LDA #$04 ; file not found
F706 .BY $2C
F707 A9 05 LDA #$05 ; device not present
F709 .BY $2C
F70A A9 06 LDA #$06 ; not input file
F70C .BY $2C
F70D A9 07 LDA #$07 ; not output file
F70F .BY $2C
F710 A9 08 LDA #$08 ; file name missing
F712 .BY $2C
F713 A9 09 LDA #$09 ; illegal device no.
F715 48 PHA
F716 20 CC FF JSR $FFCC
F719 A0 00 LDY #$00
F71B 24 9D BIT $9D
F71D 50 0A BVC $F729
F71F 20 2F F1 JSR $F12F
F722 68 PLA
F723 48 PHA
F724 09 30 ORA #$30
F726 20 D2 FF JSR $FFD2
F729 68 PLA
F72A 38 SEC
F72B 60 RTS
; get next file header from cassette
F72C A5 93 LDA $93
F72E 48 PHA
F72F 20 41 F8 JSR $F841
F732 68 PLA
F733 85 93 STA $93
F735 B0 32 BCS $F769
F737 A0 00 LDY #$00
F739 B1 B2 LDA ($B2),Y
F73B C9 05 CMP #$05
F73D F0 2A BEQ $F769
F73F C9 01 CMP #$01
F741 F0 08 BEQ $F74B
F743 C9 03 CMP #$03
F745 F0 04 BEQ $F74B
F747 C9 04 CMP #$04
F749 D0 E1 BNE $F72C
F74B AA TAX
F74C 24 9D BIT $9D
F74E 10 17 BPL $F767
F750 A0 63 LDY #$63
F752 20 2F F1 JSR $F12F
F755 A0 05 LDY #$05
F757 B1 B2 LDA ($B2),Y
F759 20 D2 FF JSR $FFD2
F75C C8 INY
F75D C0 15 CPY #$15
F75F D0 F6 BNE $F757
F761 A5 A1 LDA $A1
F763 20 E0 E4 JSR $E4E0
F766 EA NOP
F767 18 CLC
F768 88 DEY
F769 60 RTS
; write a special block to cassette with code in A
F76A 85 9E STA $9E
F76C 20 D0 F7 JSR $F7D0
F76F 90 5E BCC $F7CF
F771 A5 C2 LDA $C2
F773 48 PHA
F774 A5 C1 LDA $C1
F776 48 PHA
F777 A5 AF LDA $AF
F779 48 PHA
F77A A5 AE LDA $AE
F77C 48 PHA
F77D A0 BF LDY #$BF
F77F A9 20 LDA #$20
F781 91 B2 STA ($B2),Y
F783 88 DEY
F784 D0 FB BNE $F781
F786 A5 9E LDA $9E
F788 91 B2 STA ($B2),Y
F78A C8 INY
F78B A5 C1 LDA $C1
F78D 91 B2 STA ($B2),Y
F78F C8 INY
F790 A5 C2 LDA $C2
F792 91 B2 STA ($B2),Y
F794 C8 INY
F795 A5 AE LDA $AE
F797 91 B2 STA ($B2),Y
F799 C8 INY
F79A A5 AF LDA $AF
F79C 91 B2 STA ($B2),Y
F79E C8 INY
F79F 84 9F STY $9F
F7A1 A0 00 LDY #$00
F7A3 84 9E STY $9E
F7A5 A4 9E LDY $9E
F7A7 C4 B7 CPY $B7
F7A9 F0 0C BEQ $F7B7
F7AB B1 BB LDA ($BB),Y
F7AD A4 9F LDY $9F
F7AF 91 B2 STA ($B2),Y
F7B1 E6 9E INC $9E
F7B3 E6 9F INC $9F
F7B5 D0 EE BNE $F7A5
F7B7 20 D7 F7 JSR $F7D7
F7BA A9 69 LDA #$69
F7BC 85 AB STA $AB
F7BE 20 6B F8 JSR $F86B
F7C1 A8 TAY
F7C2 68 PLA
F7C3 85 AE STA $AE
F7C5 68 PLA
F7C6 85 AF STA $AF
F7C8 68 PLA
F7C9 85 C1 STA $C1
F7CB 68 PLA
F7CC 85 C2 STA $C2
F7CE 98 TYA
F7CF 60 RTS
; set tape buffer pointer in XY
F7D0 A6 B2 LDX $B2
F7D2 A4 B3 LDY $B3
F7D4 C0 02 CPY #$02
F7D6 60 RTS
; set cassette buffer to I/O area
F7D7 20 D0 F7 JSR $F7D0
F7DA 8A TXA
F7DB 85 C1 STA $C1
F7DD 18 CLC
F7DE 69 C0 ADC #$C0
F7E0 85 AE STA $AE
F7E2 98 TYA
F7E3 85 C2 STA $C2
F7E5 69 00 ADC #$00
F7E7 85 AF STA $AF
F7E9 60 RTS
; search tape for a file name
F7EA 20 2C F7 JSR $F72C
F7ED B0 1D BCS $F80C
F7EF A0 05 LDY #$05
F7F1 84 9F STY $9F
F7F3 A0 00 LDY #$00
F7F5 84 9E STY $9E
F7F7 C4 B7 CPY $B7
F7F9 F0 10 BEQ $F80B
F7FB B1 BB LDA ($BB),Y
F7FD A4 9F LDY $9F
F7FF D1 B2 CMP ($B2),Y
F801 D0 E7 BNE $F7EA
F803 E6 9E INC $9E
F805 E6 9F INC $9F
F807 A4 9E LDY $9E
F809 D0 EC BNE $F7F7
F80B 18 CLC
F80C 60 RTS
; add 1 to tape index and test for overflow
F80D 20 D0 F7 JSR $F7D0
F810 E6 A6 INC $A6
F812 A4 A6 LDY $A6
F814 C0 C0 CPY #$C0
F816 60 RTS
; handle messages and test cassette buttons for read
F817 20 2E F8 JSR $F82E
F81A F0 1A BEQ $F836
F81C A0 1B LDY #$1B
F81E 20 2F F1 JSR $F12F
F821 20 D0 F8 JSR $F8D0
F824 20 2E F8 JSR $F82E
F827 D0 F8 BNE $F821
F829 A0 6A LDY #$6A
F82B 4C 2F F1 JMP $F12F
; test sense line for a button depressed on cassette
F82E A9 10 LDA #$10
F830 24 01 BIT $01
F832 D0 02 BNE $F836
F834 24 01 BIT $01
F836 18 CLC
F837 60 RTS
; set messages and test cassette line for input
F838 20 2E F8 JSR $F82E
F83B F0 F9 BEQ $F836
F83D A0 2E LDY #$2E
F83F D0 DD BNE $F81E
; read a block from cassette
F841 A9 00 LDA #$00
F843 85 90 STA $90
F845 85 93 STA $93
F847 20 D7 F7 JSR $F7D7
F84A 20 17 F8 JSR $F817
F84D B0 1F BCS $F86E
F84F 78 SEI
F850 A9 00 LDA #$00
F852 85 AA STA $AA
F854 85 B4 STA $B4
F856 85 B0 STA $B0
F858 85 9E STA $9E
F85A 85 9F STA $9F
F85C 85 9C STA $9C
F85E A9 90 LDA #$90
F860 A2 0E LDX #$0E
F862 D0 11 BNE $F875
; write a block from cassette
F864 20 D7 F7 JSR $F7D7
F867 A9 14 LDA #$14
F869 85 AB STA $AB
F86B 20 38 F8 JSR $F838
F86E B0 6C BCS $F8DC
F870 78 SEI
F871 A9 82 LDA #$82
F873 A2 08 LDX #$08
; common code for cassette read and write
F875 A0 7F LDY #$7F
F877 8C 0D DC STY $DC0D
F87A 8D 0D DC STA $DC0D
F87D AD 0E DC LDA $DC0E
F880 09 19 ORA #$19
F882 8D 0F DC STA $DC0F
F885 29 91 AND #$91
F887 8D A2 02 STA $02A2
F88A 20 A4 F0 JSR $F0A4
F88D AD 11 D0 LDA $D011
F890 29 EF AND #$EF
F892 8D 11 D0 STA $D011
F895 AD 14 03 LDA $0314
F898 8D 9F 02 STA $029F
F89B AD 15 03 LDA $0315
F89E 8D A0 02 STA $02A0
F8A1 20 BD FC JSR $FCBD
F8A4 A9 02 LDA #$02
F8A6 85 BE STA $BE
F8A8 20 97 FB JSR $FB97
F8AB A5 01 LDA $01
F8AD 29 1F AND #$1F
F8AF 85 01 STA $01
F8B1 85 C0 STA $C0
F8B3 A2 FF LDX #$FF
F8B5 A0 FF LDY #$FF
F8B7 88 DEY
F8B8 D0 FD BNE $F8B7
F8BA CA DEX
F8BB D0 F8 BNE $F8B5
F8BD 58 CLI
F8BE AD A0 02 LDA $02A0
F8C1 CD 15 03 CMP $0315
F8C4 18 CLC
F8C5 F0 15 BEQ $F8DC
F8C7 20 D0 F8 JSR $F8D0
F8CA 20 BC F6 JSR $F6BC
F8CD 4C BE F8 JMP $F8BE
; handle stop key during cassette operations
F8D0 20 E1 FF JSR $FFE1
F8D3 18 CLC
F8D4 D0 0B BNE $F8E1
F8D6 20 93 FC JSR $FC93
F8D9 38 SEC
F8DA 68 PLA
F8DB 68 PLA
F8DC A9 00 LDA #$00
F8DE 8D A0 02 STA $02A0
F8E1 60 RTS
; schedule CIA 1 timer A depending on X
F8E2 86 B1 STX $B1
F8E4 A5 B0 LDA $B0
F8E6 0A ASL
F8E7 0A ASL
F8E8 18 CLC
F8E9 65 B0 ADC $B0
F8EB 18 CLC
F8EC 65 B1 ADC $B1
F8EE 85 B1 STA $B1
F8F0 A9 00 LDA #$00
F8F2 24 B0 BIT $B0
F8F4 30 01 BMI $F8F7
F8F6 2A ROL
F8F7 06 B1 ASL $B1
F8F9 2A ROL
F8FA 06 B1 ASL $B1
F8FC 2A ROL
F8FD AA TAX
F8FE AD 06 DC LDA $DC06
F901 C9 16 CMP #$16
F903 90 F9 BCC $F8FE
F905 65 B1 ADC $B1
F907 8D 04 DC STA $DC04
F90A 8A TXA
F90B 6D 07 DC ADC $DC07
F90E 8D 05 DC STA $DC05
F911 AD A2 02 LDA $02A2
F914 8D 0E DC STA $DC0E
F917 8D A4 02 STA $02A4
F91A AD 0D DC LDA $DC0D
F91D 29 10 AND #$10
F91F F0 09 BEQ $F92A
F921 A9 F9 LDA #$F9
F923 48 PHA
F924 A9 2A LDA #$2A
F926 48 PHA
F927 4C 43 FF JMP $FF43
F92A 58 CLI
F92B 60 RTS
; cassette read IRQ routine
F92C AE 07 DC LDX $DC07
F92F A0 FF LDY #$FF
F931 98 TYA
F932 ED 06 DC SBC $DC06
F935 EC 07 DC CPX $DC07
F938 D0 F2 BNE $F92C
F93A 86 B1 STX $B1
F93C AA TAX
F93D 8C 06 DC STY $DC06
F940 8C 07 DC STY $DC07
F943 A9 19 LDA #$19
F945 8D 0F DC STA $DC0F
F948 AD 0D DC LDA $DC0D
F94B 8D A3 02 STA $02A3
F94E 98 TYA
F94F E5 B1 SBC $B1
F951 86 B1 STX $B1
F953 4A LSR
F954 66 B1 ROR $B1
F956 4A LSR
F957 66 B1 ROR $B1
F959 A5 B0 LDA $B0
F95B 18 CLC
F95C 69 3C ADC #$3C
F95E C5 B1 CMP $B1
F960 B0 4A BCS $F9AC
F962 A6 9C LDX $9C
F964 F0 03 BEQ $F969
F966 4C 60 FA JMP $FA60
F969 A6 A3 LDX $A3
F96B 30 1B BMI $F988
F96D A2 00 LDX #$00
F96F 69 30 ADC #$30
F971 65 B0 ADC $B0
F973 C5 B1 CMP $B1
F975 B0 1C BCS $F993
F977 E8 INX
F978 69 26 ADC #$26
F97A 65 B0 ADC $B0
F97C C5 B1 CMP $B1
F97E B0 17 BCS $F997
F980 69 2C ADC #$2C
F982 65 B0 ADC $B0
F984 C5 B1 CMP $B1
F986 90 03 BCC $F98B
F988 4C 10 FA JMP $FA10
F98B A5 B4 LDA $B4
F98D F0 1D BEQ $F9AC
F98F 85 A8 STA $A8
F991 D0 19 BNE $F9AC
F993 E6 A9 INC $A9
F995 B0 02 BCS $F999
F997 C6 A9 DEC $A9
F999 38 SEC
F99A E9 13 SBC #$13
F99C E5 B1 SBC $B1
F99E 65 92 ADC $92
F9A0 85 92 STA $92
F9A2 A5 A4 LDA $A4
F9A4 49 01 EOR #$01
F9A6 85 A4 STA $A4
F9A8 F0 2B BEQ $F9D5
F9AA 86 D7 STX $D7
F9AC A5 B4 LDA $B4
F9AE F0 22 BEQ $F9D2
F9B0 AD A3 02 LDA $02A3
F9B3 29 01 AND #$01
F9B5 D0 05 BNE $F9BC
F9B7 AD A4 02 LDA $02A4
F9BA D0 16 BNE $F9D2
F9BC A9 00 LDA #$00
F9BE 85 A4 STA $A4
F9C0 8D A4 02 STA $02A4
F9C3 A5 A3 LDA $A3
F9C5 10 30 BPL $F9F7
F9C7 30 BF BMI $F988
F9C9 A2 A6 LDX #$A6
F9CB 20 E2 F8 JSR $F8E2
F9CE A5 9B LDA $9B
F9D0 D0 B9 BNE $F98B
F9D2 4C BC FE JMP $FEBC
F9D5 A5 92 LDA $92
F9D7 F0 07 BEQ $F9E0
F9D9 30 03 BMI $F9DE
F9DB C6 B0 DEC $B0
F9DD .BY $2C
F9DE E6 B0 INC $B0
F9E0 A9 00 LDA #$00
F9E2 85 92 STA $92
F9E4 E4 D7 CPX $D7
F9E6 D0 0F BNE $F9F7
F9E8 8A TXA
F9E9 D0 A0 BNE $F98B
F9EB A5 A9 LDA $A9
F9ED 30 BD BMI $F9AC
F9EF C9 10 CMP #$10
F9F1 90 B9 BCC $F9AC
F9F3 85 96 STA $96
F9F5 B0 B5 BCS $F9AC
F9F7 8A TXA
F9F8 45 9B EOR $9B
F9FA 85 9B STA $9B
F9FC A5 B4 LDA $B4
F9FE F0 D2 BEQ $F9D2
FA00 C6 A3 DEC $A3
FA02 30 C5 BMI $F9C9
FA04 46 D7 LSR $D7
FA06 66 BF ROR $BF
FA08 A2 DA LDX #$DA
FA0A 20 E2 F8 JSR $F8E2
FA0D 4C BC FE JMP $FEBC
FA10 A5 96 LDA $96
FA12 F0 04 BEQ $FA18
FA14 A5 B4 LDA $B4
FA16 F0 07 BEQ $FA1F
FA18 A5 A3 LDA $A3
FA1A 30 03 BMI $FA1F
FA1C 4C 97 F9 JMP $F997
FA1F 46 B1 LSR $B1
FA21 A9 93 LDA #$93
FA23 38 SEC
FA24 E5 B1 SBC $B1
FA26 65 B0 ADC $B0
FA28 0A ASL
FA29 AA TAX
FA2A 20 E2 F8 JSR $F8E2
FA2D E6 9C INC $9C
FA2F A5 B4 LDA $B4
FA31 D0 11 BNE $FA44
FA33 A5 96 LDA $96
FA35 F0 26 BEQ $FA5D
FA37 85 A8 STA $A8
FA39 A9 00 LDA #$00
FA3B 85 96 STA $96
FA3D A9 81 LDA #$81
FA3F 8D 0D DC STA $DC0D
FA42 85 B4 STA $B4
FA44 A5 96 LDA $96
FA46 85 B5 STA $B5
FA48 F0 09 BEQ $FA53
FA4A A9 00 LDA #$00
FA4C 85 B4 STA $B4
FA4E A9 01 LDA #$01
FA50 8D 0D DC STA $DC0D
FA53 A5 BF LDA $BF
FA55 85 BD STA $BD
FA57 A5 A8 LDA $A8
FA59 05 A9 ORA $A9
FA5B 85 B6 STA $B6
FA5D 4C BC FE JMP $FEBC
; receive next byte from cassette
FA60 20 97 FB JSR $FB97
FA63 85 9C STA $9C
FA65 A2 DA LDX #$DA
FA67 20 E2 F8 JSR $F8E2
FA6A A5 BE LDA $BE
FA6C F0 02 BEQ $FA70
FA6E 85 A7 STA $A7
FA70 A9 0F LDA #$0F
FA72 24 AA BIT $AA
FA74 10 17 BPL $FA8D
FA76 A5 B5 LDA $B5
FA78 D0 0C BNE $FA86
FA7A A6 BE LDX $BE
FA7C CA DEX
FA7D D0 0B BNE $FA8A
FA7F A9 08 LDA #$08
FA81 20 1C FE JSR $FE1C
FA84 D0 04 BNE $FA8A
FA86 A9 00 LDA #$00
FA88 85 AA STA $AA
FA8A 4C BC FE JMP $FEBC
FA8D 70 31 BVS $FAC0
FA8F D0 18 BNE $FAA9
FA91 A5 B5 LDA $B5
FA93 D0 F5 BNE $FA8A
FA95 A5 B6 LDA $B6
FA97 D0 F1 BNE $FA8A
FA99 A5 A7 LDA $A7
FA9B 4A LSR
FA9C A5 BD LDA $BD
FA9E 30 03 BMI $FAA3
FAA0 90 18 BCC $FABA
FAA2 18 CLC
FAA3 B0 15 BCS $FABA
FAA5 29 0F AND #$0F
FAA7 85 AA STA $AA
FAA9 C6 AA DEC $AA
FAAB D0 DD BNE $FA8A
FAAD A9 40 LDA #$40
FAAF 85 AA STA $AA
FAB1 20 8E FB JSR $FB8E
FAB4 A9 00 LDA #$00
FAB6 85 AB STA $AB
FAB8 F0 D0 BEQ $FA8A
FABA A9 80 LDA #$80
FABC 85 AA STA $AA
FABE D0 CA BNE $FA8A
FAC0 A5 B5 LDA $B5
FAC2 F0 0A BEQ $FACE
FAC4 A9 04 LDA #$04
FAC6 20 1C FE JSR $FE1C
FAC9 A9 00 LDA #$00
FACB 4C 4A FB JMP $FB4A
FACE 20 D1 FC JSR $FCD1
FAD1 90 03 BCC $FAD6
FAD3 4C 48 FB JMP $FB48
FAD6 A6 A7 LDX $A7
FAD8 CA DEX
FAD9 F0 2D BEQ $FB08
FADB A5 93 LDA $93
FADD F0 0C BEQ $FAEB
FADF A0 00 LDY #$00
FAE1 A5 BD LDA $BD
FAE3 D1 AC CMP ($AC),Y
FAE5 F0 04 BEQ $FAEB
FAE7 A9 01 LDA #$01
FAE9 85 B6 STA $B6
FAEB A5 B6 LDA $B6
FAED F0 4B BEQ $FB3A
FAEF A2 3D LDX #$3D
FAF1 E4 9E CPX $9E
FAF3 90 3E BCC $FB33
FAF5 A6 9E LDX $9E
FAF7 A5 AD LDA $AD
FAF9 9D 01 01 STA $0101,X
FAFC A5 AC LDA $AC
FAFE 9D 00 01 STA $0100,X
FB01 E8 INX
FB02 E8 INX
FB03 86 9E STX $9E
FB05 4C 3A FB JMP $FB3A
FB08 A6 9F LDX $9F
FB0A E4 9E CPX $9E
FB0C F0 35 BEQ $FB43
FB0E A5 AC LDA $AC
FB10 DD 00 01 CMP $0100,X
FB13 D0 2E BNE $FB43
FB15 A5 AD LDA $AD
FB17 DD 01 01 CMP $0101,X
FB1A D0 27 BNE $FB43
FB1C E6 9F INC $9F
FB1E E6 9F INC $9F
FB20 A5 93 LDA $93
FB22 F0 0B BEQ $FB2F
FB24 A5 BD LDA $BD
FB26 A0 00 LDY #$00
FB28 D1 AC CMP ($AC),Y
FB2A F0 17 BEQ $FB43
FB2C C8 INY
FB2D 84 B6 STY $B6
FB2F A5 B6 LDA $B6
FB31 F0 07 BEQ $FB3A
FB33 A9 10 LDA #$10
FB35 20 1C FE JSR $FE1C
FB38 D0 09 BNE $FB43
FB3A A5 93 LDA $93
FB3C D0 05 BNE $FB43
FB3E A8 TAY
FB3F A5 BD LDA $BD
FB41 91 AC STA ($AC),Y
FB43 20 DB FC JSR $FCDB
FB46 D0 43 BNE $FB8B
FB48 A9 80 LDA #$80
FB4A 85 AA STA $AA
FB4C 78 SEI
FB4D A2 01 LDX #$01
FB4F 8E 0D DC STX $DC0D
FB52 AE 0D DC LDX $DC0D
FB55 A6 BE LDX $BE
FB57 CA DEX
FB58 30 02 BMI $FB5C
FB5A 86 BE STX $BE
FB5C C6 A7 DEC $A7
FB5E F0 08 BEQ $FB68
FB60 A5 9E LDA $9E
FB62 D0 27 BNE $FB8B
FB64 85 BE STA $BE
FB66 F0 23 BEQ $FB8B
FB68 20 93 FC JSR $FC93
FB6B 20 8E FB JSR $FB8E
FB6E A0 00 LDY #$00
FB70 84 AB STY $AB
FB72 B1 AC LDA ($AC),Y
FB74 45 AB EOR $AB
FB76 85 AB STA $AB
FB78 20 DB FC JSR $FCDB
FB7B 20 D1 FC JSR $FCD1
FB7E 90 F2 BCC $FB72
FB80 A5 AB LDA $AB
FB82 45 BD EOR $BD
FB84 F0 05 BEQ $FB8B
FB86 A9 20 LDA #$20
FB88 20 1C FE JSR $FE1C
FB8B 4C BC FE JMP $FEBC
; move save/load address into $AC/$AD
FB8E A5 C2 LDA $C2
FB90 85 AD STA $AD
FB92 A5 C1 LDA $C1
FB94 85 AC STA $AC
FB96 60 RTS
; initalise cassette read/write variables
FB97 A9 08 LDA #$08
FB99 85 A3 STA $A3
FB9B A9 00 LDA #$00
FB9D 85 A4 STA $A4
FB9F 85 A8 STA $A8
FBA1 85 9B STA $9B
FBA3 85 A9 STA $A9
FBA5 60 RTS
; schedule CIA 1 timer B and invert casette write line
FBA6 A5 BD LDA $BD
FBA8 4A LSR
FBA9 A9 60 LDA #$60
FBAB 90 02 BCC $FBAF
FBAD A9 B0 LDA #$B0
FBAF A2 00 LDX #$00
FBB1 8D 06 DC STA $DC06
FBB4 8E 07 DC STX $DC07
FBB7 AD 0D DC LDA $DC0D
FBBA A9 19 LDA #$19
FBBC 8D 0F DC STA $DC0F
FBBF A5 01 LDA $01
FBC1 49 08 EOR #$08
FBC3 85 01 STA $01
FBC5 29 08 AND #$08
FBC7 60 RTS
; IRQ routine for cassette write B
FBC8 38 SEC
FBC9 66 B6 ROR $B6
FBCB 30 3C BMI $FC09
FBCD A5 A8 LDA $A8
FBCF D0 12 BNE $FBE3
FBD1 A9 10 LDA #$10
FBD3 A2 01 LDX #$01
FBD5 20 B1 FB JSR $FBB1
FBD8 D0 2F BNE $FC09
FBDA E6 A8 INC $A8
FBDC A5 B6 LDA $B6
FBDE 10 29 BPL $FC09
FBE0 4C 57 FC JMP $FC57
FBE3 A5 A9 LDA $A9
FBE5 D0 09 BNE $FBF0
FBE7 20 AD FB JSR $FBAD
FBEA D0 1D BNE $FC09
FBEC E6 A9 INC $A9
FBEE D0 19 BNE $FC09
FBF0 20 A6 FB JSR $FBA6
FBF3 D0 14 BNE $FC09
FBF5 A5 A4 LDA $A4
FBF7 49 01 EOR #$01
FBF9 85 A4 STA $A4
FBFB F0 0F BEQ $FC0C
FBFD A5 BD LDA $BD
FBFF 49 01 EOR #$01
FC01 85 BD STA $BD
FC03 29 01 AND #$01
FC05 45 9B EOR $9B
FC07 85 9B STA $9B
FC09 4C BC FE JMP $FEBC
FC0C 46 BD LSR $BD
FC0E C6 A3 DEC $A3
FC10 A5 A3 LDA $A3
FC12 F0 3A BEQ $FC4E
FC14 10 F3 BPL $FC09
FC16 20 97 FB JSR $FB97
FC19 58 CLI
FC1A A5 A5 LDA $A5
FC1C F0 12 BEQ $FC30
FC1E A2 00 LDX #$00
FC20 86 D7 STX $D7
FC22 C6 A5 DEC $A5
FC24 A6 BE LDX $BE
FC26 E0 02 CPX #$02
FC28 D0 02 BNE $FC2C
FC2A 09 80 ORA #$80
FC2C 85 BD STA $BD
FC2E D0 D9 BNE $FC09
FC30 20 D1 FC JSR $FCD1
FC33 90 0A BCC $FC3F
FC35 D0 91 BNE $FBC8
FC37 E6 AD INC $AD
FC39 A5 D7 LDA $D7
FC3B 85 BD STA $BD
FC3D B0 CA BCS $FC09
FC3F A0 00 LDY #$00
FC41 B1 AC LDA ($AC),Y
FC43 85 BD STA $BD
FC45 45 D7 EOR $D7
FC47 85 D7 STA $D7
FC49 20 DB FC JSR $FCDB
FC4C D0 BB BNE $FC09
FC4E A5 9B LDA $9B
FC50 49 01 EOR #$01
FC52 85 BD STA $BD
FC54 4C BC FE JMP $FEBC
FC57 C6 BE DEC $BE
FC59 D0 03 BNE $FC5E
FC5B 20 CA FC JSR $FCCA
FC5E A9 50 LDA #$50
FC60 85 A7 STA $A7
FC62 A2 08 LDX #$08
FC64 78 SEI
FC65 20 BD FC JSR $FCBD
FC68 D0 EA BNE $FC54
; IRQ routine for cassette write A
FC6A A9 78 LDA #$78
FC6C 20 AF FB JSR $FBAF
FC6F D0 E3 BNE $FC54
FC71 C6 A7 DEC $A7
FC73 D0 DF BNE $FC54
FC75 20 97 FB JSR $FB97
FC78 C6 AB DEC $AB
FC7A 10 D8 BPL $FC54
FC7C A2 0A LDX #$0A
FC7E 20 BD FC JSR $FCBD
FC81 58 CLI
FC82 E6 AB INC $AB
FC84 A5 BE LDA $BE
FC86 F0 30 BEQ $FCB8
FC88 20 8E FB JSR $FB8E
FC8B A2 09 LDX #$09
FC8D 86 A5 STX $A5
FC8F 86 B6 STX $B6
FC91 D0 83 BNE $FC16
; switch from cassette IRQ to default IRQ
FC93 08 PHP
FC94 78 SEI
FC95 AD 11 D0 LDA $D011
FC98 09 10 ORA #$10
FC9A 8D 11 D0 STA $D011
FC9D 20 CA FC JSR $FCCA
FCA0 A9 7F LDA #$7F
FCA2 8D 0D DC STA $DC0D
FCA5 20 DD FD JSR $FDDD
FCA8 AD A0 02 LDA $02A0
FCAB F0 09 BEQ $FCB6
FCAD 8D 15 03 STA $0315
FCB0 AD 9F 02 LDA $029F
FCB3 8D 14 03 STA $0314
FCB6 28 PLP
FCB7 60 RTS
; terminate cassette I/O
FCB8 20 93 FC JSR $FC93
FCBB F0 97 BEQ $FC54
; set IRQ vector depending on X
FCBD BD 93 FD LDA $FD93,X
FCC0 8D 14 03 STA $0314
FCC3 BD 94 FD LDA $FD94,X
FCC6 8D 15 03 STA $0315
FCC9 60 RTS
; stop cassette motor
FCCA A5 01 LDA $01
FCCC 09 20 ORA #$20
FCCE 85 01 STA $01
FCD0 60 RTS
; compare $AC/$AD with $AE/$AF
FCD1 38 SEC
FCD2 A5 AC LDA $AC
FCD4 E5 AE SBC $AE
FCD6 A5 AD LDA $AD
FCD8 E5 AF SBC $AF
FCDA 60 RTS
; increment $AC/$AD
FCDB E6 AC INC $AC
FCDD D0 02 BNE $FCE1
FCDF E6 AD INC $AD
FCE1 60 RTS
; RESET routine
FCE2 A2 FF LDX #$FF
FCE4 78 SEI
FCE5 9A TXS
FCE6 D8 CLD
FCE7 20 02 FD JSR $FD02
FCEA D0 03 BNE $FCEF
FCEC 6C 00 80 JMP ($8000) ; start cartridge
FCEF 8E 16 D0 STX $D016
FCF2 20 A3 FD JSR $FDA3
FCF5 20 50 FD JSR $FD50
FCF8 20 15 FD JSR $FD15
FCFB 20 5B FF JSR $FF5B
FCFE 58 CLI
FCFF 6C 00 A0 JMP ($A000) ; start basic
; check for a cartridge
FD02 A2 05 LDX #$05
FD04 BD 0F FD LDA $FD0F,X
FD07 DD 03 80 CMP $8003,X
FD0A D0 03 BNE $FD0F
FD0C CA DEX
FD0D D0 F5 BNE $FD04
FD0F 60 RTS
; CBM80
FD10 .BY $C3,$C2,$CD,$38,$30
; restore I/O vectors
FD15 A2 30 LDX #$30 ; low FD30
FD17 A0 FD LDY #$FD ; high FD30
FD19 18 CLC
; set I/O vectors depending on XY
FD1A 86 C3 STX $C3
FD1C 84 C4 STY $C4
FD1E A0 1F LDY #$1F
FD20 B9 14 03 LDA $0314,Y
FD23 B0 02 BCS $FD27
FD25 B1 C3 LDA ($C3),Y
FD27 91 C3 STA ($C3),Y
FD29 99 14 03 STA $0314,Y
FD2C 88 DEY
FD2D 10 F1 BPL $FD20
FD2F 60 RTS
; vectors for OS at $0314-$0333
FD30 .WD $EA31 ; IRQ
FD32 .WD $FE66 ; BRK
FD34 .WD $FE47 ; NMI
FD36 .WD $F34A ; open
FD38 .WD $F291 ; close
FD3A .WD $F20E ; set input dev
FD3C .WD $F250 ; set output dev
FD3E .WD $F333 ; restore I/O
FD40 .WD $F157 ; input
FD42 .WD $F1CA ; output
FD44 .WD $F6ED ; test stop key
FD46 .WD $F13E ; get
FD48 .WD $F32F ; abort I/O
FD4A .WD $FE66 ; unused (BRK)
FD4C .WD $F4A5 ; load ram
FD4E .WD $F5ED ; save ram
; initalise memory pointers
FD50 A9 00 LDA #$00
FD52 A8 TAY
FD53 99 02 00 STA $0002,Y
FD56 99 00 02 STA $0200,Y
FD59 99 00 03 STA $0300,Y
FD5C C8 INY
FD5D D0 F4 BNE $FD53
FD5F A2 3C LDX #$3C
FD61 A0 03 LDY #$03
FD63 86 B2 STX $B2
FD65 84 B3 STY $B3
FD67 A8 TAY
FD68 A9 03 LDA #$03
FD6A 85 C2 STA $C2
FD6C E6 C2 INC $C2
FD6E B1 C1 LDA ($C1),Y
FD70 AA TAX
FD71 A9 55 LDA #$55
FD73 91 C1 STA ($C1),Y
FD75 D1 C1 CMP ($C1),Y
FD77 D0 0F BNE $FD88
FD79 2A ROL
FD7A 91 C1 STA ($C1),Y
FD7C D1 C1 CMP ($C1),Y
FD7E D0 08 BNE $FD88
FD80 8A TXA
FD81 91 C1 STA ($C1),Y
FD83 C8 INY
FD84 D0 E8 BNE $FD6E
FD86 F0 E4 BEQ $FD6C
FD88 98 TYA
FD89 AA TAX
FD8A A4 C2 LDY $C2
FD8C 18 CLC
FD8D 20 2D FE JSR $FE2D
FD90 A9 08 LDA #$08
FD92 8D 82 02 STA $0282
FD95 A9 04 LDA #$04
FD97 8D 88 02 STA $0288
FD9A 60 RTS
; IRQ vectors
FD9B .WD $FC6A ; cassette write A
FD9D .WD $FBCD ; cassette write B
FD9F .WD $EA31 ; standard IRQ
FDA1 .WD $F92C ; cassette read
; initaliase I/O devices
FDA3 A9 7F LDA #$7F
FDA5 8D 0D DC STA $DC0D
FDA8 8D 0D DD STA $DD0D
FDAB 8D 00 DC STA $DC00
FDAE A9 08 LDA #$08
FDB0 8D 0E DC STA $DC0E
FDB3 8D 0E DD STA $DD0E
FDB6 8D 0F DC STA $DC0F
FDB9 8D 0F DD STA $DD0F
FDBC A2 00 LDX #$00
FDBE 8E 03 DC STX $DC03
FDC1 8E 03 DD STX $DD03
FDC4 8E 18 D4 STX $D418
FDC7 CA DEX
FDC8 8E 02 DC STX $DC02
FDCB A9 07 LDA #$07
FDCD 8D 00 DD STA $DD00
FDD0 A9 3F LDA #$3F
FDD2 8D 02 DD STA $DD02
FDD5 A9 E7 LDA #$E7
FDD7 85 01 STA $01
FDD9 A9 2F LDA #$2F
FDDB 85 00 STA $00
; initalise TAL1/TAH1 fpr 1/60 of a second
FDDD AD A6 02 LDA $02A6
FDE0 F0 0A BEQ $FDEC
FDE2 A9 25 LDA #$25
FDE4 8D 04 DC STA $DC04
FDE7 A9 40 LDA #$40
FDE9 4C F3 FD JMP $FDF3
FDEC A9 95 LDA #$95
FDEE 8D 04 DC STA $DC04
FDF1 A9 42 LDA #$42
FDF3 8D 05 DC STA $DC05
FDF6 4C 6E FF JMP $FF6E
; initalise file name parameters
FDF9 85 B7 STA $B7
FDFB 86 BB STX $BB
FDFD 84 BC STY $BC
FDFF 60 RTS
; inatalise file parameters
FE00 85 B8 STA $B8
FE02 86 BA STX $BA
FE04 84 B9 STY $B9
FE06 60 RTS
; read I/O status word
FE07 A5 BA LDA $BA
FE09 C9 02 CMP #$02
FE0B D0 0D BNE $FE1A
FE0D AD 97 02 LDA $0297
FE10 48 PHA
FE11 A9 00 LDA #$00
FE13 8D 97 02 STA $0297
FE16 68 PLA
FE17 60 RTS
; control kernel messages
FE18 85 9D STA $9D
; read ST
FE1A A5 90 LDA $90
; add A to ST
FE1C 05 90 ORA $90
FE1E 85 90 STA $90
FE20 60 RTS
; set timeout on serail bus
FE21 8D 85 02 STA $0285
FE24 60 RTS
; read/set top of memory
FE25 90 06 BCC $FE2D
FE27 AE 83 02 LDX $0283
FE2A AC 84 02 LDY $0284
FE2D 8E 83 02 STX $0283
FE30 8C 84 02 STY $0284
FE33 60 RTS
; read/set bottom of memory
FE34 90 06 BCC $FE3C
FE36 AE 81 02 LDX $0281
FE39 AC 82 02 LDY $0282
FE3C 8E 81 02 STX $0281
FE3F 8C 82 02 STY $0282
FE42 60 RTS
; NMI entry
FE43 78 SEI
FE44 6C 18 03 JMP ($0318) ; normally FE47
; standard NMI routine
FE47 48 PHA
FE48 8A TXA
FE49 48 PHA
FE4A 98 TYA
FE4B 48 PHA
FE4C A9 7F LDA #$7F
FE4E 8D 0D DD STA $DD0D
FE51 AC 0D DD LDY $DD0D
FE54 30 1C BMI $FE72
FE56 20 02 FD JSR $FD02
FE59 D0 03 BNE $FE5E
FE5B 6C 02 80 JMP ($8002) ; cartridge warm start
FE5E 20 BC F6 JSR $F6BC
FE61 20 E1 FF JSR $FFE1
FE64 D0 0C BNE $FE72
; BRK routine
FE66 20 15 FD JSR $FD15
FE69 20 A3 FD JSR $FDA3
FE6C 20 18 E5 JSR $E518
FE6F 6C 02 A0 JMP ($A002)
; internal NMI
FE72 98 TYA
FE73 2D A1 02 AND $02A1
FE76 AA TAX
FE77 29 01 AND #$01
FE79 F0 28 BEQ $FEA3
FE7B AD 00 DD LDA $DD00
FE7E 29 FB AND #$FB
FE80 05 B5 ORA $B5
FE82 8D 00 DD STA $DD00
FE85 AD A1 02 LDA $02A1
FE88 8D 0D DD STA $DD0D
FE8B 8A TXA
FE8C 29 12 AND #$12
FE8E F0 0D BEQ $FE9D
FE90 29 02 AND #$02
FE92 F0 06 BEQ $FE9A
FE94 20 D6 FE JSR $FED6
FE97 4C 9D FE JMP $FE9D
FE9A 20 07 FF JSR $FF07
FE9D 20 BB EE JSR $EEBB
FEA0 4C B6 FE JMP $FEB6
FEA3 8A TXA
FEA4 29 02 AND #$02
FEA6 F0 06 BEQ $FEAE
FEA8 20 D6 FE JSR $FED6
FEAB 4C B6 FE JMP $FEB6
FEAE 8A TXA
FEAF 29 10 AND #$10
FEB1 F0 03 BEQ $FEB6
FEB3 20 07 FF JSR $FF07
FEB6 AD A1 02 LDA $02A1
FEB9 8D 0D DD STA $DD0D
FEBC 68 PLA
FEBD A8 TAY
FEBE 68 PLA
FEBF AA TAX
FEC0 68 PLA
FEC1 40 RTI
; baud rate tables
FEC2 .WD $27C1 ; 50
FEC4 .WD $1A3E ; 75
FEC6 .WD $11C5 ; 110
FEC8 .WD $0E74 ; 134.5
FECA .WD $0CED ; 150
FECC .WD $0645 ; 300
FECE .WD $02F0 ; 600
FED0 .WD $0146 ; 1200
FED2 .WD $00B8 ; 1800
FED4 .WD $0071 ; 2400
; input next bit on RS-232 and schedule TB2
FED6 AD 01 DD LDA $DD01
FED9 29 01 AND #$01
FEDB 85 A7 STA $A7
FEDD AD 06 DD LDA $DD06
FEE0 E9 1C SBC #$1C
FEE2 6D 99 02 ADC $0299
FEE5 8D 06 DD STA $DD06
FEE8 AD 07 DD LDA $DD07
FEEB 6D 9A 02 ADC $029A
FEEE 8D 07 DD STA $DD07
FEF1 A9 11 LDA #$11
FEF3 8D 0F DD STA $DD0F
FEF6 AD A1 02 LDA $02A1
FEF9 8D 0D DD STA $DD0D
FEFC A9 FF LDA #$FF
FEFE 8D 06 DD STA $DD06
FF01 8D 07 DD STA $DD07
FF04 4C 59 EF JMP $EF59
; schedule TB2 using baud rate factor
FF07 AD 95 02 LDA $0295
FF0A 8D 06 DD STA $DD06
FF0D AD 96 02 LDA $0296
FF10 8D 07 DD STA $DD07
FF13 A9 11 LDA #$11
FF15 8D 0F DD STA $DD0F
FF18 A9 12 LDA #$12
FF1A 4D A1 02 EOR $02A1
FF1D 8D A1 02 STA $02A1
FF20 A9 FF LDA #$FF
FF22 8D 06 DD STA $DD06
FF25 8D 07 DD STA $DD07
FF28 AE 98 02 LDX $0298
FF2B 86 A8 STX $A8
FF2D 60 RTS
; continuation of baud rate calculation
FF2E AA TAX
FF2F AD 96 02 LDA $0296
FF32 2A ROL
FF33 A8 TAY
FF34 8A TXA
FF35 69 C8 ADC #$C8
FF37 8D 99 02 STA $0299
FF3A 98 TYA
FF3B 69 00 ADC #$00
FF3D 8D 9A 02 STA $029A
FF40 60 RTS
FF41 EA NOP
FF42 EA NOP
FF43 08 PHP
FF44 68 PLA
FF45 29 EF AND #$EF
FF47 48 PHA
; IRQ entry point
FF48 48 PHA
FF49 8A TXA
FF4A 48 PHA
FF4B 98 TYA
FF4C 48 PHA
FF4D BA TSX
FF4E BD 04 01 LDA $0104,X
FF51 29 10 AND #$10
FF53 F0 03 BEQ $FF58
FF55 6C 16 03 JMP ($0316) ; normally FE66
FF58 6C 14 03 JMP ($0314) ; normally EA31
; addition to I/O device initalisation
FF5B 20 18 E5 JSR $E518
FF5E AD 12 D0 LDA $D012
FF61 D0 FB BNE $FF5E
FF63 AD 19 D0 LDA $D019
FF66 29 01 AND #$01
FF68 8D A6 02 STA $02A6
FF6B 4C DD FD JMP $FDDD
; end of scheduling TA for 1/60 second IRQ's
FF6E A9 81 LDA #$81
FF70 8D 0D DC STA $DC0D
FF73 AD 0E DC LDA $DC0E
FF76 29 80 AND #$80
FF78 09 11 ORA #$11
FF7A 8D 0E DC STA $DC0E
FF7D 4C 8E EE JMP $EE8E
; kernal version number
FF80 .BY $03
; kernal vectors
FF81 4C 5B FF JMP $FF5B ; initalise screen and keyboard
FF84 4C A3 FD JMP $FDA3 ; initalise I/O devices
FF87 4C 50 FD JMP $FD50 ; initalise memory pointers
FF8A 4C 15 FD JMP $FD15 ; restore I/O vectors
FF8D 4C 1A FD JMP $FD1A ; set I/O vectors from XY
FF90 4C 18 FE JMP $FE18 ; control kernal messages
FF93 4C B9 ED JMP $EDB9 ; read secondary address after listen
FF96 4C C7 ED JMP $EDC7 ; read secondary address after talk
FF99 4C 25 FE JMP $FE25 ; read/set top of memory
FF9C 4C 34 FE JMP $FE34 ; read/set bottom of memory
FF9F 4C 87 EA JMP $EA87 ; scan keyboard
FFA2 4C 21 FE JMP $FE21 ; set timout for serial bus
FFA5 4C 13 EE JMP $EE13 ; input on serial bus
FFA8 4C DD ED JMP $EDDD ; output byte on serial bus
FFAB 4C EF ED JMP $EDEF ; send untalk on serial bus
FFAE 4C FE ED JMP $EDFE ; send unlisten on serial bus
FFB1 4C 0C ED JMP $ED0C ; send listen on serial bus
FFB4 4C 09 ED JMP $ED09 ; send talk on serial bus
FFB7 4C 07 FE JMP $FE07 ; read I/O status word
FFBA 4C 00 FE JMP $FE00 ; set file parameters
FFBD 4C F9 FD JMP $FDF9 ; set filename parameters
FFC0 6C 1A 03 JMP ($031A) ; (F34A) open a file
FFC3 6C 1C 03 JMP ($031C) ; (F291) close a file
FFC6 6C 1E 03 JMP ($031E) ; (F20E) set input device
FFC9 6C 20 03 JMP ($0320) ; (F250) set output device
FFCC 6C 22 03 JMP ($0322) ; (F333) restore I/O devices to default
FFCF 6C 24 03 JMP ($0324) ; (F157) input char on current device
FFD2 6C 26 03 JMP ($0326) ; (F1CA) output char on current device
FFD5 4C 9E F4 JMP $F49E ; load ram from device
FFD8 4C DD F5 JMP $F5DD ; save ram to device
FFDB 4C E4 F6 JMP $F6E4 ; set real time clock
FFDE 4C DD F6 JMP $F6DD ; read real time clock
FFE1 6C 28 03 JMP ($0328) ; (F6ED) check stop key
FFE4 6C 2A 03 JMP ($032A) ; (F13E) get a character
FFE7 6C 2C 03 JMP ($032C) ; (F32F) close all channels and files
FFEA 4C 9B F6 JMP $F69B ; increment real time clock
FFED 4C 05 E5 JMP $E505 ; read organisation of screen into XY
FFF0 4C 0A E5 JMP $E50A ; read/set XY cursor position
FFF3 4C 00 E5 JMP $E500 ; read base address of I/O devices
; vectors
FFF6 .BY $52,$52,$42,$59 ; unused
FFFA .WD $FE43 ; NMI vector
FFFC .WD $FCE2 ; RESET vector
FFFE .WD $FF48 ; IRQ/BRK vector