Subject: Re: [stella] Pokey Mod For A 2600 From: crackers@xxxxxxxx Date: Sat, 18 Oct 1997 14:55:57 -0400 (EDT) |
In article , you wrote: >In article <3.0.1.32.19971018161505.0071b6e0@xxxxxxxxxxxxxxxxxxxxx>, you wrote: >>>Anyone got any information on how exactly activision implimented the >>>pokey chip in the Pitfall][ cart? >> >>AKAIK Pitfall II does not use the pokey chip. It uses volume samples. >>The chip inside the cart just takes a value out of it's sample ROM at >>a given rate and masks it into the same normal ROM address everytime. >>That way the program can read the value from there and put it into the >>TIA's volume register without wasting too much time of the scanline by >>calculating which sample value to read next. >~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~ > >Doh! But I wonder if an internal Pokey Mod would still be possible for the >2600. > >Or if there's a way to duplicate the effects of this custom activision >chip internally. > >Writing to the TIA sound on each scanline would give you what? >192 x 60Hz... 11.52KHz sample rate... not too bad for a 2600. > > CRACKERS > (Hmmmm from hell!!!!) -- Accordionist - Wethifl Musician - Atari 2600 Collector | /\/\ *NEW CrAB URL* http://www.hwcn.org/~ad329/crab.html ***| \^^/ Bira Bira Devotee - FES Member - Samurai Pizza Cats Fan| =\/= -- 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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