From dchoi@cern.ch Wed Nov 16 12:01:56 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!dchoi
From: dchoi@cern.ch (Dong-hyun Choi)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Nov16.120156.9903@cern.ch>
Date: Wed, 16 Nov 1994 12:01:56 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.
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?

-- 
=== Dong-hyun Choi ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"Do not worship the copy."

From gdubois@kiae.su Thu Nov 17 13:36:56 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!gdubois
From: gdubois@kiae.su (Graham Dubois)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Nov17.133656.1575@kiae.su>
Date: Thu, 17 Nov 1994 13:36:56 GMT
References: <1994Nov16.120156.9903@cern.ch>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1994Nov16.120156.9903@cern.ch>, dchoi@cern.ch (Dong-hyun Choi) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Graham Dubois | gdubois@kiae.su
PGP Key fingerprint: E100 D5B8 3DE5 7ADF
"Keep the channels open."

From scampbell@rwth-aachen.de Sat Nov 19 02:44:56 1994
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!scampbell
From: scampbell@rwth-aachen.de (Sven Campbell)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Nov19.024456.2855@rwth-aachen.de>
Date: Sat, 19 Nov 1994 02:44:56 GMT
References: <1994Nov16.120156.9903@cern.ch>
Organization: RWTH Aachen Informatik
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In article <1994Nov16.120156.9903@cern.ch>, dchoi@cern.ch (Dong-hyun Choi) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.

-- 
Sven Campbell | scampbell@rwth-aachen.de
PGP Key fingerprint: B890 52D8 3F5C E893
"Keep the channels open."

From kpark@cam.ac.uk Sun Nov 20 21:15:56 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!kpark
From: kpark@cam.ac.uk (Kirsty Park)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Nov20.211556.2787@cam.ac.uk>
Date: Sun, 20 Nov 1994 21:15:56 GMT
References: <1994Nov16.120156.9903@cern.ch> <1994Nov17.133656.1575@kiae.su>
Organization: University of Cambridge Computer Laboratory
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In article <1994Nov17.133656.1575@kiae.su>, gdubois@kiae.su (Graham Dubois) writes:
> The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.
> My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

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

-- 
Kirsty Park
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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