Hi there!
Another little optimization saving a few bytes:
You can merge the two ENABL writes into one:
>; --- Draw Ball ---
> DEC ScanCount ; 5
> LDA ScanCount ; 3
> SEC ; 2
> SBC BallY ; 3
> ADC #BALL_HEIGHT; 2
> BCS DrawBall2 ; 2/3
> LDA #0 ; 2
> SLEEP 19
> JMP SkipDrawBall2 ; 3 47
>DrawBall2
> LDY BallTabPtr ; 3
> LDA BallSizeTab,Y ; 4
> STA CTRLPF ; 3
> LDA BallShiftTab,Y ; 4
> STA HMBL ; 3
> DEC BallTabPtr ; 5 ; 47
> LDA BallEnableTab,Y ; 4
>SkipDrawBall2
> STA ENABL ; 3
Oh, and another neato "should I draw or should I go"
trick like this might work for you too:
> LDX #$1F
> TXS
> LDA BallY
> SEC
> SBC ScanCount
> ADC #251
> AND #$FC
> PHP
Works only for ballsize=4 and requires some stack
overhead and hm... but you'd still need to verify your
second ENABL condition... ah... ok, it'll probably not
help you...
;-)
Greetings,
Manuel
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