Re: [stella] Pokey Mod For A 2600

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 <>, 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
>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 | /\/\
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