mirror of https://github.com/mist64/msbasic.git
336 lines
6.4 KiB
ArmAsm
336 lines
6.4 KiB
ArmAsm
.segment "EXTRA"
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stx SHIFTSIGNEXT
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stx $0800
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inx
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stx Z17
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stx Z18
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stx TXTTAB
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lda #$08
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sta TXTTAB+1
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jsr SCRTCH
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sta STACK+255
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LFD81:
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jsr PRIMM
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.byte $1B,$06,$01,$0C
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.byte "INTELLIVISION BASIC"
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.byte $0D,$0A,$0A
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.byte "Copyright Microsoft, Mattel 1980"
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.byte $0D,$0A,$00
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sta $0435
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sta $8F
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ldy #$0F
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lda #$FF
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sta ($04),y
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jsr LDE8C
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.byte $0C ; NOP $xxxx
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jmp RESTART
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OUTQUESSP:
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jsr OUTQUES
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jmp OUTSP
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INLIN:
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ldy #$FF
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LFDDC:
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iny
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LFDDD:
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jsr GETLN
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cmp #$03 ; CTRL+C
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beq LFDF7
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cmp #$20
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bcs LFDEC ; no control char
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sbc #$09
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bne LFDDD
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LFDEC:
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sta INPUTBUFFER,y
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tax
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bne LFDDC
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jsr CRDO2
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ldy #$06
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LFDF7:
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tax
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clc
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rts
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LFDFA:
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bit $8F
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bmi LFE01
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jsr LDE48
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LFE01:
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bit $8F
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bvc LFE10
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jmp LDE53
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LFE08:
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jsr LFDFA
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LFE0B:
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jsr LDE24
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bne LFE08
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LFE10:
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rts
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VSAV:
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jsr GARBAG
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lda FRETOP
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sta $00
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lda FRETOP+1
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.byte $85
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LFE1B:
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ora ($A5,x)
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.byte $2F
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sta $02
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lda STREND+1
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sta $03
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ldy #$00
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LFE26:
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lda ($00),y
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sta ($02),y
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inc $02
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bne LFE30
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inc $03
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LFE30:
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inc $00
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bne LFE26
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inc $01
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bit $01
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bvc LFE26
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ldx VARTAB
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ldy VARTAB+1
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lda #$01
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bne LFE50
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PSAV:
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lda VARTAB
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sta $02
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lda VARTAB+1
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sta $03
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ldx #$01
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ldy #$08
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lda #$02
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LFE50:
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sta $0513
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stx $0503
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stx $00
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sty $0504
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sty $01
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ldy #$0D
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lda #$00
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LFE61:
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sta $0504,y
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dey
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bne LFE61
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sty $0500
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lda #$40
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sta $0505
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lda $02
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sec
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sbc $00
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sta $00
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lda $03
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sbc $01
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sta $01
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lsr a
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lsr a
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lsr a
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sta $03
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jsr LE870
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sta $02
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jsr CHRGOT
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beq LFEA6
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cmp #$2C
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beq L40FA
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jmp SYNERR
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L40FA:
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jsr CHRGET
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jsr LE870
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sec
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sbc $02
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cmp $03
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bpl LFEBF
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lda #$27
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sta JMPADRS
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jmp LFFBD
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LFEA6:
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lda $02
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clc
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adc $03
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jsr LE874
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pha
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jsr LFE0B
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jsr L6874
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.byte $72
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adc $00,x
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pla
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tax
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lda #$00
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jsr LINPRT
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LFEBF:
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ldx #$07
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LBF83:
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dex
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lda VARTAB,x
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sec
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sbc TXTTAB,x
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sta $051B,x
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lda VARTAB+1,x
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sbc TXTTAB+1,x
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sta $051C,x
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dex
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bpl LBF83
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txa
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sbc FRETOP
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sta $0521
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lda #>CONST_MEMSIZ
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sbc FRETOP+1
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sta $0522
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lda FRETOP
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sta $0523
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lda FRETOP+1
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sta $0524
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ldx $02
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jsr LFFDD
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jsr LFFD1
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lda $01
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ldx #$05
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LFEF7:
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stx $0511
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ldy #$E4
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sec
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sbc #$08
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sta $01
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bpl LFF15
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adc #$08
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asl $00
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rol a
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asl $00
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rol a
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asl $00
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rol a
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adc #$01
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sta $0505
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ldy #$00
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LFF15:
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sty $0512
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jsr LE4C0
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ldx #$00
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lda $01
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bpl LFEF7
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LFF21:
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rts
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VLOD:
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jsr LFFD1
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stx JMPADRS
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lda VARTAB
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ldy VARTAB+1
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ldx #$01
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jsr LFF64
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ldx #$00
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ldy #$02
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LFF34:
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jsr LE39A
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iny
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iny
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inx
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inx
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cpx #$05
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bmi LFF34
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lda STREND
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sta LOWTR
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lda STREND+1
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sta LOWTR+1
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lda FRETOP
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sta HIGHTR
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lda FRETOP+1
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sta HIGHTR+1
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lda #<CONST_MEMSIZ
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sta HIGHDS
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lda #>CONST_MEMSIZ
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sta HIGHDS+1
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lda $0523
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sta FRETOP
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lda $0524
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sta FRETOP+1
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jmp BLTU2
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LFF64:
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sta $9A
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sty $9B
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stx $00
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jsr LE870
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jsr LFFDD
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lda JMPADRS
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beq LFF7F
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lda #$01
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sta $9A
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lda #$08
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sta $9B
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jsr STXTPT
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LFF7F:
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lda $9A
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sta $0503
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lda $9B
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sta $0504
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lda #$ED
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sta $0512
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lda #$05
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sta $01
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LFF92:
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ldx $0512
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beq LFF21
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ldy #$04
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jsr LE4C4
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lda $01
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cmp $0511
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bne LFFB2
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lda #$00
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sta $01
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lda $00
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cmp $0513
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beq LFF92
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lda #$18
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bne LFFB8
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LFFB2:
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lda #$27
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bne LFFB8
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LFFB6:
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lda #$3C
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LFFB8:
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sta JMPADRS
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jsr CLEARC
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LFFBD:
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jsr VARTAB_MINUS_2_TO_AY
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sta $9A
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sty $9B
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lda #$00
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tay
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sta ($9A),y
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iny
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sta ($9A),y
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ldx JMPADRS
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jmp ERROR
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LFFD1:
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ldx #$00
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LFFD3:
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lda #$02
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.byte $2C
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LFFD6:
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lda #$03
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jsr LDE8C
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asl FACSIGN
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LFFDD:
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jsr CHRGOT
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beq LFFE5
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jmp SYNERR
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LFFE5:
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lda #$0D
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ldy #$00
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jsr LDE8C
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.byte $06
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LFFED:
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lda $034C
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bmi LFFED
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ldy #$01
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lda ($04),y
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bne LFFB6
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rts
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.byte $FF
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; NMI
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.addr LC000
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; RESET
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.addr LC000
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; IRQ
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.addr LC009
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