On Monday, June 24, 2002, at 09:38 PM, Ruffin Bailey wrote:
Not sure why I use the accumulator to initialize HMM0 and then
immediately use the Y register to do the same thing in this code:
LDA #$00 ;2
STA HMM0 ;3
LDA SWCHA ;4 SWCHA dissection
BMI LF065 ;2 Player 0 | Player 1
LDY #$00 ;2 ===============|===============
STY HMM0 ;3 D7 D6 D5 D4 | D3 D2 D1 D0
Oh for heaven's sake, I'm an idiot. This is the code where I was trying
to do what you were asking about. Sheesh. The above code will stop the
missile from going to the right.
This is what shoulda originally been there, before I set things equal to
zero:
LDA #$00 ;2
STA HMM0 ;3
LDA SWCHA ;4 SWCHA dissection
BMI LF065 ;2 Player 0 | Player 1
LDY #$F0 ;2 ===============|===============
STY HMM0 ;3 D7 D6 D5 D4 | D3 D2 D1 D0
LF065: ROL ;2 rt lt dn up | rt lt dn up
So I initially load zero into HMM0 with the accum, then I load SWCHA
into A to check on the joystick in the next line (which means I can't
use A anymore for loading up a value to stick into HMM0), then I check
to see if the user is moving the joystick right, and if not I skip past
putting #$F0 into HMM0 and the missile doesn't go right.
etc etc
Sorry for any confusion my confusing myself caused you. :) Better go
to sleep now.
Ruffin Bailey
http://myfreakinname.blogspot.com
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