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From: jkenyon@janus.mtroyal.ab.ca
Newsgroups: comp.sys.atari.st.tech
Subject: Blitter support chip info needed
Message-ID: <1991Jan4.022630.4406@janus.mtroyal.ab.ca>
Date: 4 Jan 91 09:26:29 GMT
Organization: Mount Royal College, Calgary, Alberta
Lines: 22

I'm own an Atari 2080ST (Yes, such a beast exists - even if it says marketing
sample on the bottom :-)).  Here's is the catch, I want to add a blitter to it
(it has the socket) but I'm missing a support chip for the blitter.  Any one out
there know what it is ?  If I add the blitter and boot the machine it hangs
half way thru the booting processing before even getting to the hard drive.
Remove the blitter and all is fine.

Techincal specs:

Board revision: C10059 REV 2.
The missing chip is a 20 pin DIP marked as U69 with it's associated capacitor
marked as C98.
The blitter chip is marked as U66.
Both the blitter and the missing IC are near the lower right hand corner.
Most of the lines that run form the blitter to the IC are in the pins 50-60
roughly as numbered on the blitter.

Any help would be appreciated.  Thanks.
Nick.

P.S.  Atari doesn't officially support or recognize this model but any help
      form Atari personel would be appreciated.  Allan?