Subject: [stella] Cosmic Ark scanline pixel doubling From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx> Date: Fri, 11 Mar 2005 20:15:34 -0500 |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Fri, 11 Mar 2005, Eckhard Stolberg wrote: > BTW, since you are studying the TIA schematics, did you already > have a look at the setup logic for the movable-object output? > I'm wondering if there might be something in there that could > be messed up by a HMOVE pulse happening during this setup > procedure, because there is some pixel doubling and deleting > in some scanlines during the Cosmic Ark starfield effect that > I can't explain. I wish I could say that staring at these schematics for hours on end has made me the sort of minor diety that could answer this question instantly. I assume you're refering to this post from back in 1997? http://www.biglist.com/lists/stella/archives/199705/msg00061.html I have to honestly say I don't know what's going on here. I just completed a testable version of my tia.vhd for the fpga2600 project last night, and will begin designing hardware for testing "soon". I think my version gets the various NUSIZ tricks right. These just sort of fall out naturally. But I'm at a bit of a loss for the HMOVE tricks. I've tried walking through this logic a few times before, but I get lost in the intricacies of exactly what happens when HMOVE gets hit before the required setup time has occurred. (Hrm, just found a bug in my HMOVE handling. Off to fix it...) - -- adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam KG6GZR http://cuddlepuddle.org/~adam/resume.html -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFCMjE3yvXf5Z0z5zERArdOAJ9dKjHvl6vvsPd0UsSTKXczFOhRNwCg0wAX tvcFJZyq19gqtn21mNrFq0g= =9GhD -----END PGP SIGNATURE----- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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