Thomas Jentzsch <tjentzsch@xxxxxx> wrote:
> Skipdraw is meant for player objects. For particle objects like
> missiles or the ball this code is better:
Lee's "ball" actually is the TIA player0 and player1 objects, which
is why I mentioned SkipDraw ;-)
> tya ; 2 assuming y contains the scanline
> sbc yPos ; 3 carry must be 1 (else use DCP)
> adc #HEIGHT ; 2
> lda #2 ; 2
> adc #$ff ; 2 carry is always set!
> sta ENAMx/BL ; 3 bit 1 depends on the carry after ADC
> ; total: 14 cycles
Too bad the PHP trick can't use the carry flag instead of the Z
flag, or that could be *really* fast :)
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