Subject: RE: [stella] RESPx and player positions From: "John Saeger" <john@xxxxxxxxxxx> Date: Thu, 23 Apr 1998 09:23:50 -0700 |
> >Hum.... I thought HBLANK lasted 68 color clocks? So wouldn't 22 * 3 = 66 > >still be during HBLANK or am I counting something wrong? > > When I wrote trick.a65, I didn't do much cycle counting. I positioned > the STA RESP0 at the earliest cycle possible by trial and error. I > only noticed that it was cycle 22, when you brought it up. > > It might be possible, that the TIA finishes it's setup routine already > at cycle 22, since cycle 23 ends one pixel in the display. > > This would explain the stange gun position in Atlantis. The > RESPx might end at cycle 22, which would be 2 pixels before > display time. If we add the strange 5 pixel offset, the gun > would be at pixel 3. The HMOVE of 3 pixels to the left, that > you mentioned, would put the gun right at pixel 1. Interesting. This might also explain odd behavior of MS PACMAN (in emulators anyway). Forgive me, but where do I find a copy of TRICK.A65? Thanks, John -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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