Hi Glenn,
> Actually, I am very interested in optimizations. I've been trying to do
> quite a bit since the last build I sent to the list.
Hmmm...just looking at the surface you could move your initialization to a lookup table. This could save you a few bytes. This is if you're flexable in moving your variables around.
I also see some opportunities for some unconditional branches. You could change
.ramp_up_initialize_pitch
LDA #31
sta AUD0_Last_Pitch,X
jmp .ramp_up_register
to
.ramp_up_initialize_pitch
LDA #31
sta AUD0_Last_Pitch,X
bne .ramp_up_register
to save a byte.
You can also change...
.delta_Y_negative
lda #1
sta Overlay1;flag for negative
JMP .continue_Y_Accelerate
.delta_Y_positive
lda #0
sta Overlay1;flag for positive
to
.delta_Y_negative
lda #1
BIT_W ;.byte $2C
.delta_Y_positive
lda #0
sta Overlay1;flag for positive
which will save you 5 bytes.
Also you could remove the jsr's in your mainloop. This could save you 18 bytes and stack RAM. There's really no need to have these even though I know a lot of us use them. I guess you could have them if you don't need the space but if you're fighting for *every* ROM byte I'd get rid of them.
I hope this little bit helped. Taking these suggestions should help a little as there are a number of places this could help. Of course there are more tricks that can be done ;-)
Take care,
Dennis
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