Subject: Re: [stella] RESBL strangeness, answered (maybe) From: Erik Mooney <erik@xxxxxxxxxx> Date: Thu, 10 Oct 2002 17:03:25 -0400 |
10/10/2002 4:48:38 PM, "Eric Ball" <eball@xxxxxxxxxx> wrote: >Fixed the kernel and did some more testing, and I think I've figured it >out. It appears that the actual start pixel for the ball is at RESBL + 4 >pixels. So if I want to position the ball starting at onscreen pixel 2, I >have to hit RESBL at CPU clock (68 + 2 - 4) / 3 = 22. (Which, of course, >wrecks my nifty 8 cycle timing loop. Sigh. But it looks like it was off >anyway...) > >Or have I got it wrong entirely? Yeah, that's right; it's a quirk of the TIA silicon. It does the same mysterious 4-pixel offset for missile positioning, and (inexplicably) a 5-pixel offset for players. ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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