[stella] Do the math

[Manuel Rotschkar <cybergoth@xxxxxxxx>]

Hi there!

Just a small snippet I have here. While highly specialized, I thought it 
might be a nice example of transfering a small math formula into 6502 ASM.

; xdelay = 211 - int((xpos+2)/3)

    LDY #$01
    LDA xpos
    CLC
    ADC #02
    SEC
DivideBy3
    DEY
    SBC #$03
    BCS DivideBy3
    TYA
    ADC #211
    STA xdelay

Greetings,
	Manuel
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