Subject: Re: R: R: R: [stella] PCMSG 2.4 (ok, I've had enough...) From: Nick S Bensema <nickb@xxxxxxxxxxxx> Date: Fri, 22 Aug 1997 16:32:02 -0700 (MST) |
>The two timer loops (one to wait for the end of Vblank, the other for >Overscan), are like this: > >LF20C: LDA INTIM > BNE LF20C > STA WSYNC > >That is, there's not a STA WSYNC immediately before the start of the loop, >but how could this matter..? It could affect your calculations, offsetting the result by just a few cycles. If that BNE is enough to put the TIA "over the hump" into the next scanline, the WSYNC will give you an additional scanline on top of that. This should be pretty rare, but if it does happen, reducing the value placed into INTIM by 1 should fix it. I kind of thought I compensated for this in my text file, but it's an old file and I haven't written anything but suckyzep since then. -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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R: R: R: [stella] PCMSG 2.4 (ok, I', Piero Cavina | Thread | Re: R: R: R: [stella] PCMSG 2.4 (ok, Eckhard Stolberg |
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