Thanks guys! You're both absolutely right about the
ZP stuff. I knew about ZP taking one cycle less, but
for some reason I counted them otherwise. Which is
why I was asking. :)
And double thanks for the link below. Awsome stuff.
--- Dennis Debro <ddebro@xxxxxxxxxxxxx> wrote:
> You have the right idea but some of your opcode
> timing values are off. Look at
> http://www.6502.org/tutorials/6502opcodes.htm for a
> list of opcodes and the time it takes to execute
> them.
> > LDA PF0Data,X ;[10] 5
> The above instruction will take 4 cycles if the
> table look up doesn't cross a page boundary.
>
> > CPY LanderYPos ;[29] 4
> This is ZP, right? Then it will take 3 cycles
>
> > LDA LanderHeight ;[35] 4
> > STA LanderVisible ;[39] 4
> These would take 3 cycles
>
> > LDX LanderVisible ;[36] or [43] 4
> 3 cycles here
>
> > DEC LanderVisible ;[54] or [62] 6
> 5 cycles here
>
> I hope this helps.
>
> Take care,
> Dennis
=====
Time will be when the broadest river dries
And the great cities wane and last descend
Into the dust, for all things have an end.
- Chaucer
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