>LDA flashTimer
>AND #%00000010
>BNE skip
Huh? Is flashTimer being incredmented or decrement somewhere? If so, from what/to what? In order to implement, you're also going to need something like:
DEC flashTimer
BPL notresetflashTimer
LDA #%00000011
STA flashTimer
notresetflashTimer:
LDA flashTimer
AND #%00000010
BNE skip
Which is fine if he has a frame counting variable which can serve double duty so he doesn't need to add the extra code, but otherwise it is a big increase in overhead.
Actually, I just re-read Dennis' post and I realised he's actually doing something like this:
lda girdercolour
eor #%00000001 ;bit0 is unused by colour registers
sta girdercolour
ldy #0
lda girdercolour
and #%000000001
beq nogirder
ldy girdercolour
nogirder:
sty COLUP0
My solution would be:
ldy #0
lda framevariable
adc #%01000000 ;or #%0010000 or #%00010000 (&etc)
sta framevariable
bmi skip
ldy girdercolour ;This probably doesn't need to be a variable anymore
skip:
sty COLUP0
Which actually saves a few bytes ROM but at the cost of a byte of RAM (unless we can now eliminate the girdercolour variable, in which case it's break-even). If he does have a general frame counter variable then your solution may be better but if not, I'm sticking with mine.
Chris...
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