Subject: Re: [stella] Kool Aid Man compatible detection From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx> Date: Sun, 10 Oct 2004 08:00:57 -0700 (PDT) |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sun, 10 Oct 2004, Eckhard Stolberg wrote: > BTW, while you are looking at the TIA schematics, could you > find out when exactly the audio output is updated? I think the > TIA changes the audio output twice per scanline, and I'd like to > know when exactly this happens. Changes to the registers happen immediately, but you won't hear the difference until the next audio clock, which is driven off the horizontal position counter. So yeah, it'll sound like it updates twice per scanline. If you want to know exactly where in the scanline, you can look at the comparators off the ripple counter on page one of the tia schematics, in the upper right corner. (The wired nor values that feed into latches that drive the audio phase one and two clocks around about grid C5). Without spending it too much time on it, it looks like changes for the clocks happen when the horizontal position counter resets, at "late reset hblank", at "reset h sync" and at "center" (whenever that is), although I don't know which of those are rising edges and which are falling edges. - -- adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam KG6GZR http://cuddlepuddle.org/~adam/resume.html "Did he get the girl? Oh, yeah. Why do you think he is drinking?" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFBaU6nyvXf5Z0z5zERAq1lAJ9VbtLbrcDmMckRezftO9bPRlsPNgCcDWS8 lw+uOGjm6i3+foMdqhGvqhQ= =ybbQ -----END PGP SIGNATURE-----
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