From loliveira@rwth-aachen.de Tue May 17 17:20:25 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!loliveira
From: loliveira@rwth-aachen.de (Lars Oliveira)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994May17.172025.1118@rwth-aachen.de>
Date: Tue, 17 May 1994 17:20:25 GMT
Organization: RWTH Aachen Informatik
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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.
Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

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

-- 
Lars Oliveira
Opinions expressed are solely my own and not those of RWTH Aachen Informatik.
------------------------------------------------------------

From nivanov@demon.co.uk Wed May 18 18:59:25 1994
Path: ashpoly!cascade!transat!ukc!fennimore!demon!nivanov
From: nivanov@demon.co.uk (Nadia Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994May18.185925.3125@demon.co.uk>
Date: Wed, 18 May 1994 18:59:25 GMT
References: <1994May17.172025.1118@rwth-aachen.de>
Organization: Demon Internet Services UK
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In article <1994May17.172025.1118@rwth-aachen.de>, loliveira@rwth-aachen.de (Lars Oliveira) 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.

-- 
=== Nadia Ivanov ===
Dept of Electrical Engineering, Demon Internet Services UK
"Do not worship the copy."