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 Post subject: Gimmick mapper sound
PostPosted: Sun Jul 08, 2007 6:34 pm 
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Joined: Sat Oct 29, 2005 2:09 am
Posts: 502
Location: Indianapolis
Well I haven't posted in awhile, and I just did a little work on the infamous Gimmick cart.

Turns out the sound hardware on it appears to really be a copy of an AY-3-981x down to the noise generator and enveloper.

I have to run more tests on it, but the enveloper works and the noise gen works, including the 5 bit prescaler for it, and the ability to turn it on/off in the mixer control register.

I have to see if the envelope gen is 4 or 5 bits though. A real AY chip is 4 bits and the Yamaha copy is 5.

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