From lfischer@panix.com Sun Dec 17 07:50:10 1995
Path: ashpoly!cascade!mxgate!coyoacan!panix!lfischer
From: lfischer@panix.com (Liam Fischer)
Newsgroups: comp.sys.m68k
Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Dec17.075010.2404@panix.com>
Date: Sun, 17 Dec 1995 07:50:10 GMT
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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.
At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
Liam Fischer <lfischer@panix.com>
SupraFAXModem 28.8 @ ISDN 64k bps
"Do not worship the copy."

From dsuzuki@tum.de Sun Dec 17 22:47:10 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!dsuzuki
From: dsuzuki@tum.de (Dmitri Suzuki)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Dec17.224710.4289@tum.de>
Date: Sun, 17 Dec 1995 22:47:10 GMT
References: <1995Dec17.075010.2404@panix.com>
Organization: Technische Universität München
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In article <1995Dec17.075010.2404@panix.com>, lfischer@panix.com (Liam Fischer) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
Dmitri Suzuki
Tape trading list upon request. SASE required for international mail.