Subject: [stella] A quickie... From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx> Date: Sun, 16 Nov 2003 17:57:07 -0800 (PST) |
I'm trying to capture audio from a real 2600 so I can reverse engineer the taps in the audio linear feedback shift registers in the TIA. I've tried using the schematics to figure them out, but I get a little befuddled, and this looks like a fun way to do it anyway. I've been able to use source from an emulator to figure out what the 4 bit and 5 bit polynomials are, but the emulator uses random numbers for the 9 bit polynomial and I want to know the real polynomial for an actual TIA. So here's what I need (my assembly is rusty, and this outa be quick for somebody who's set up to do it already): a 4K binary which does the following: set AUDV1 to 0 set AUDV0 to 16 set AUDF0 to 32 set AUDC0 to 0 loop forever { wait 1 second increment AUDC0 } This outa give me a binary that will cycle through the sounds, so I can sample them with a sound card and reverse engineer the polynomials. Can anyone help me? -- adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam/pgp.html Will code for food. http://cuddlepuddle.org/~adam/resume.html "The dinosaurs are not around today because they did not have a space program." -- Arthur C. Clarke ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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