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From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: New Custom Chips?
Message-ID: <2417@cbmvax.UUCP>
Date: Tue, 29-Sep-87 02:25:15 EDT
Article-I.D.: cbmvax.2417
Posted: Tue Sep 29 02:25:15 1987
Date-Received: Thu, 1-Oct-87 02:48:06 EDT
References: <2948@hoptoad.uucp> <2345@cbmvax.UUCP> <2472@xanth.UUCP> <3823@zen.berkeley.edu>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 24

In article <3823@zen.berkeley.edu> bryce@hoser.berkeley.edu (Bryce Nesbitt) writes:
> I'll bet someone could take the new chips and build a tower to stick them
> into an Amiga 1000.  Assuming a hypothetical "Fat Agnus" pin compatible chip
> with 1 or 2 Megabytes of CHIP RAM potential the logic to do this is
> convoluted, but looks doable.  You would need to plug into the current Agnus
> socket and run a clip or three down to the motherboard.  Most of the logic on
> the board would be to unwind and/or selectively ignore the extra logic inside
> Fat Agnus.  With FAST enough logic, timing margins should still be ok.
> The rest of the board would be an extra 512K or 1.5Meg of CHIP memory.
> 
> [BTW: I know a company that would like to sell this.  In fact, I've been
> asked to the design it.  Now if only Commodore comes out with the part! :-) ]

Good luck.  No reason you shouldn't be able to demonstrate your design using
the current Fat Agnus, problem being that most of the margins are eaten up
by the fat vs. the external componentry on the A1000.  Also there are real
differences on who is providing the clocks and so on.  Doesn't mean it can't
be done, but you'd probably find it easier to redo the whole board than make
a tower.
 
-- 
George Robbins - now working for,	uucp: {ihnp4|rutgers|allegra}!cbmvax!grr
but no way officially representing	arpa: out to lunch...
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)