105 lines
1.0 KiB
ArmAsm
105 lines
1.0 KiB
ArmAsm
*
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* Lode Runner
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* from MSX to A2
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*
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mx %11
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org $800
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lst off
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*---
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source = $1000
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destination = $4800
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nbLEVELS = 50
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theLEVEL = $fd
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theLINE = $fe
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nibble = $ff
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*---
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clc
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xce
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rep #$30
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lda #source
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sta readFROM+1
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lda #destination
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sta writeTO+1
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sep #$30
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*---
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stz theLEVEL
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outerLOOP stz theLINE
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innerLOOP ldx #0
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]lp jsr readFROM
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pha
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and #$0f
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tay
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lda msx2apple,y
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sta nibble
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pla
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and #$f0
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lsr
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lsr
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lsr
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lsr
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tay
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lda msx2apple,y
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asl
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asl
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asl
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asl
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ora nibble
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jsr writeTO
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inx
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cpx #14 ; et non pas 28
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bcc ]lp
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lda readFROM+1 ; next line
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and #$f0
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clc
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adc #$10
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sta readFROM+1
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inc theLINE
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lda theLINE
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cmp #16
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bcc innerLOOP
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stz readFROM+1
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inc readFROM+2 ; next top line
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stz writeTO+1
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inc writeTO+2
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inc theLEVEL
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lda theLEVEL
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cmp #nbLEVELS
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bcc outerLOOP
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rts
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*---
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readFROM lda $bdbd
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inc readFROM+1
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bne readFROM1
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inc readFROM+2
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readFROM1 rts
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*---
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writeTO sta $bdbd
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inc writeTO+1
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bne writeTO1
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inc writeTO+2
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writeTO1 rts
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*--- Data
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msx2apple hex 00,05,01,02,04,03,06,07,08,09 |