Subject: [stella] Pokey From: Glenn Saunders <krishna@xxxxxxxxxxxx> Date: Sat, 18 Oct 1997 11:04:50 -0700 (PDT) |
On Sat, 18 Oct 1997 crackers@xxxxxxxx wrote: > Anyone got any information on how exactly activision implimented the > pokey chip in the Pitfall][ cart? There is no Pokey chip in Pitfall ][. There is a custom chip called the DPC chip, as it was designed by David Crane (the old programmers were often also great hardware engineers). How it generates sound is rather complicated, and fascinating, but it still is just feeding the existing 2600 sound hardware on the fly. The DPC chip has other features as well which allow for better graphics. How that works is even more complicated, but I think it essentially works like a math coprocessor of sorts, calculating things automatically that used to take a lot of cycles to do, hence freeing up cycles that can be used to have more sprites and color changes and so on. There is a Pokey chip in 7800 Ballblazer. How it integrates with the 7800 is a mystery to me, and I don't know if such a beast would work in 2600 mode. -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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Re: [stella] Pokey Mod For A 2600, Mike St. Clair | Thread | [stella] Testing, optimization serv, Jim Nitchals |
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