From ssantos@uni-hamburg.de Sat Aug 05 19:55:18 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!ssantos
From: ssantos@uni-hamburg.de (Sergei Santos)
Newsgroups: comp.sys.m68k
Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug05.195518.6082@uni-hamburg.de>
Date: Sat, 05 Aug 1995 19:55:18 GMT
Organization: Universität Hamburg Fachbereich Informatik
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.
The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot?

-- 
=== Sergei Santos ===
Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik
"We don't sign stars. We build them."

From omoreau@ox.ac.uk Mon Aug 07 22:02:18 1995
Path: ashpoly!cascade!brgate!saturno!ox!omoreau
From: omoreau@ox.ac.uk (Olga Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug07.220218.9588@ox.ac.uk>
Date: Mon, 07 Aug 1995 22:02:18 GMT
References: <1995Aug05.195518.6082@uni-hamburg.de>
Organization: Oxford University Computing Laboratory
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In article <1995Aug05.195518.6082@uni-hamburg.de>, ssantos@uni-hamburg.de (Sergei Santos) 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.

-- 
Olga Moreau
Tape trading list upon request. SASE required for international mail.

From moliveira@mindspring.com Tue Aug 08 05:59:18 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!moliveira
From: moliveira@mindspring.com (Min-jun Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug08.055918.7791@mindspring.com>
Date: Tue, 08 Aug 1995 05:59:18 GMT
References: <1995Aug05.195518.6082@uni-hamburg.de>
Organization: MindSpring Enterprises
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In article <1995Aug05.195518.6082@uni-hamburg.de>, ssantos@uni-hamburg.de (Sergei Santos) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

-- 
Min-jun Oliveira
Opinions expressed are solely my own and not those of MindSpring Enterprises.
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