Subject: Re: [stella] Re: PCAE and Pitfall 2 From: "Eckhard Stolberg" <Eckhard_Stolberg@xxxxxx> Date: Wed, 6 Mar 2002 16:11:43 +0100 |
> How does the 2k fit with the areas x1000-x107F and x1800-x187F ? Where > are the random number generators used? I get lost as I follow the PCAE > source down into x86 assembly land... > > Any clues? The 2K of extra ROM contain some graphics data. Through the ports at the specified address range you can set some pointers into this data, which do auto-decrements and bounds checking on each new read from the pointer address. Also the DPC chip can produce samples for a three-voice squarewave tune. David Crane did file a patent for the DPC chip. A PDF version of this document can be downloaded from the patent office, I think. It contains detailed explanations of all the functions and addresses. I forgot the URL, but it has been mentioned in this list before, so searching in the stella-list archives might get you in the right direction. Ciao, Eckhard Stolberg ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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