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67 lines
931 B
ArmAsm
67 lines
931 B
ArmAsm
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; Apple 1 Cellular Automaton
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; https://mathworld.wolfram.com/CellularAutomaton.html
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; By Will Scullin
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ORG $300
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ECHO EQU $FFEF
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CR EQU $8D
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; Load Rule $5A = 90
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START LDA #$5A
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LDX #0
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RULELOOP LSR A
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TAY
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LDA #$00
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ROR A
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STA RULES,X
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TYA
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INX
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CPX #$08
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BNE RULELOOP
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; Print Row
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OUT LDA #CR
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JSR ECHO
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LDX #$00
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OUTLOOP LDA CELLS,X
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BMI SOLID
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LDA #' '
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BPL OUT
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SOLID LDA #'X'
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OUT JSR ECHO
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INX
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CPX #$27
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BCC OUTLOOP
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; Update Row
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LDA CELLS
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ASL A
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LDA #$00
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ROL A
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LDX #$FF
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UPDATELOOP INX
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TAY
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LDA CELLS+1,X
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ASL
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TYA
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ROL A
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TAY
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LDA RULE,Y
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STA CELLS,X
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TYA
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AND #$03
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CPX #$27
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BCC UPDATELOOP
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BCS OUT
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; Workspace
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CELLS DB $00,$00,$00,$00,$00,$00,$00,$00,
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DB $00,$00,$00,$00,$00,$00,$00,$00,
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DB $00,$00,$00,$80,$00,$00,$00,$00,
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DB $00,$00,$00,$00,$00,$00,$00,$00,
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DB $00,$00,$00,$00,$00,$00,$00,$00
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RULE DB $00,$00,$00,$00,$00,$00,$00,$00
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000
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001
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