Article 152574 of comp.sys.apple2:
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From: mystix1210@my-deja.com
Newsgroups: comp.sys.apple2
Subject: Re: New chip in TWGS (sources for oscillators)
Date: Mon, 13 Sep 1999 07:30:27 GMT
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In article <19990912234326.01071.00002352@ng-fj1.aol.com>,
  supertimer@aol.com (Supertimer) wrote:

> One thing to note about these TTL oscillators is that there
> are two kinds.  Full size TTL oscillators are rectangular.
> Half size TTL oscillators are square.  TWGS uses half
> size TTL oscillators.

On an additional note the Zip GS are supposed to use the full sized
oscillators.

> Actually, can someone post the sources, part numbers,
> and prices for the oscillators?  A Radio Shack part
> number and price would also be useful since some
> TWGS upgraders might find a trip to the local Radio
> Shack more convenient than mail order.

Quite unlikely that Radio Shack will have them. The ones I bought were
from a local electronics parts store, and they were the only one in the
city that would order them for me.

The part numbers for the 2 1/2 TTL's I bought were:
SG531PHC-50.0000 (50MHz good for 12.5MHz)
SG531PHC-60.0000 (60MHz good for 15 MHz)

I also ordered some full sized TTL's by mistake that are good for Zip's:
SG51PH-50.0000 (50MHz good for 12.5MHz)
SG51PH-55.0000 (55MHz good for 13.75MHz)
SG51PH-60.0000 (60MHz good for 15 MHz)

These are made by Epson and look like four legged IC's. As Supertimer
mentioned it's important to observe the proper orientation, if you put
it in wrong, you will damage it.

Also for those who are interested the 12ns SRAMs I bought were made by
Cypress PN: CY7C199-12PC

Now if only I had a working TWGS or Zip GS to put these into...


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