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From: usevitch@s24.csrd.uiuc.edu (Bryan Usevitch)
Newsgroups: sci.electronics
Subject: Re: SP0256-AL2 XTAL (was Re: Looking for SPO256-AL2 chip)
Message-ID: <1990Nov1.211506.6670@csrd.uiuc.edu>
Date: 1 Nov 90 21:15:06 GMT
References: <21381@orstcs.CS.ORST.EDU> <970015@hpdmd48.boi.hp.com> <1990Oct31.232018.24991@infonode.ingr.com>
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girzong@infonode.ingr.com (Gary Girzon) writes:


>does anyone know a good source for the 3.12 MHZ crystal required with
>the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work,
>perhaps with a higher pitch?

I was a teaching assistant for a group of students that built a speech
synthesis board around this device.  They used different crystals for
different effects (such as male and female voices) with good success.  I am
not sure if they had to modify the digital timings of the circuit to 
compensate for the different crystal values but as I remember they simply
swapped crystal values.