From vkim@berkeley.edu Fri Jan 20 02:33:50 1995
Path: ashpoly!cascade!bigsur!berkeley!vkim
From: vkim@berkeley.edu (Valeria Kim)
Newsgroups: comp.sys.m68k
Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan20.023350.1340@berkeley.edu>
Date: Fri, 20 Jan 1995 02:33:50 GMT
Organization: UC Berkeley Department of EECS
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket?

-- 
Valeria Kim
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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From klopez@earthlink.net Fri Jan 20 08:10:50 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!klopez
From: klopez@earthlink.net (Kirsty López)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan20.081050.2315@earthlink.net>
Date: Fri, 20 Jan 1995 08:10:50 GMT
References: <1995Jan20.023350.1340@berkeley.edu>
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In article <1995Jan20.023350.1340@berkeley.edu>, vkim@berkeley.edu (Valeria Kim) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.
> The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

-- 
Kirsty López
Tape trading list upon request. SASE required for international mail.