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From: dale@amiga.UUCP (Dale Luck)
Newsgroups: net.micro.amiga
Subject: Re: How do I contact the SECRET 8520 DISTRIBUTION SOCIETY?
Message-ID: <1568@amiga.amiga.UUCP>
Date: Tue, 23-Sep-86 03:46:37 EDT
Article-I.D.: amiga.1568
Posted: Tue Sep 23 03:46:37 1986
Date-Received: Tue, 23-Sep-86 07:45:12 EDT
References: <6040@alice.uUCp> <13058@amdcad.UUCP>
Reply-To: dale@tooter.UUCP (Dale Luck)
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 14

In article <13058@amdcad.UUCP> tim@amdcad.UUCP (Tim Olson) writes:
>Really, could some Amig[ite,ian...] in the know please tell us if these chips
>are 6520's or if there really is a part numbered 8520 which I don't know about?
>
The 8520 are a variation of the 6520 created just for the Amiga.
We found some timing problems with the clock on the 6520. We also turned
the unusable clock/counter(decimal sort of) into something we could use.
They are now 2 long binary counters. I use one to keep track of the beam
position and trigger a 68000 interrupt to fire of the next beam synced
blit.
There maybe some other mods we made to it as well but these are the ones
that I remember right now.

Dale Luck