Subject: Re: [stella] AOTM AFOS problems|
From: Manuel Rotschkar <cybergoth@xxxxxxxx>
Date: Thu, 01 Jul 2004 08:44:00 +0200
I attach the code, and the place where all trouble began is commented "HERE BEGINS THE PROBLEM".
When in doubt, don't guess at the cycles. Count them. Here's your code with cycle counts added. You can see it's running a total of 92 cycles per loop iteration, which is of course over the limit of 76. You can also see that the version without the UFO ran right up to 71 cycles, so adding anything to that would make it spill over.
LDA #3 DCP torpedoyPos ADC #2 STA ENABL
LDX #$1F ; Set stack outside loop TXS ... LDY vline ; Draw both missiles and ball CPY yposBackup+2 ; inside loop PHP CPY yposBackup+1 PHP CPY yposBackup PHP ... LDX #$FF ; Restore stack outside loop TXS