> Is code like
> lda (pointerP0Graphic),y
> (used in JoustPong's skipDraw) potentially vulnerable?
Only if pointerP0Graphic was at location $FF, in which case it would
retrieve the low byte of the address from $FF and the high byte from $00
(instead of $100).
Since your stack is normally growing down from $FF, it's incredibly unlikely
that you'd ever try to put a two-byte zero-page address at $FF anyway ;)
Thus:
lda ($FF),y ; retrieves a 16-bit address from location
$FF(low) and 0 (high) and then adds Y to it, and THEN retrieves the data
from memory
lda ($FE),y ; gets low byte from $FE, high from $FF (OK)
In answer to your question, no, it's not something you need to worry about.
Yes, it's a POTENTIAL problem, but one you will never encounter.
Cheers
A
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