Re: Commodore IEEE Adapters Updated

From: Matthew Hudson <>
Date: Thu, 10 Sep 2009 17:12:09 -0500
Message-ID: <>
>  Now all I need is the schematic.
> Would very high resolution & sharpness in pictures help you?

Yes. There may be some lines that run under the chips that would need to be
metered though.

> I thought the big chip F68521P (Ferranti?) would be an unknown
> factor in reverse engineering the circuit. Is it known what it
> does and possible replacements?

Thats appears to be a Fairchild made 6821 PIA. I doubt there are any
differences in it and a standard 6821.

Looking at the picture - I should have all those parts on hand. I'll have to
figure out what those diodes are
and what the cap is though.


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Received on 2009-09-10 23:00:49

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