From anovak@cam.ac.uk Tue Dec 27 13:21:05 1994
Path: ashpoly!cascade!mxgate!coyoacan!cam!anovak
From: anovak@cam.ac.uk (Amy Novak)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec27.132105.3012@cam.ac.uk>
Date: Tue, 27 Dec 1994 13:21:05 GMT
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Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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'.

Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc.

-- 
=== Amy Novak ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"They will send a copy in my place."

From mandersson@mit.edu Wed Dec 28 22:36:05 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!mandersson
From: mandersson@mit.edu (Mikhail Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec28.223605.2716@mit.edu>
Date: Wed, 28 Dec 1994 22:36:05 GMT
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In article <1994Dec27.132105.3012@cam.ac.uk>, anovak@cam.ac.uk (Amy Novak) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP?

-- 
=== Mikhail Andersson ===
Dept of Electrical Engineering, Massachusetts Institute of Technology
"Hardware is temporary. The signal survives."

From vsouza@rwth-aachen.de Fri Dec 30 11:12:05 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!vsouza
From: vsouza@rwth-aachen.de (Valeria Souza)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec30.111205.1451@rwth-aachen.de>
Date: Fri, 30 Dec 1994 11:12:05 GMT
References: <1994Dec27.132105.3012@cam.ac.uk> <1994Dec28.223605.2716@mit.edu>
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In article <1994Dec28.223605.2716@mit.edu>, mandersson@mit.edu (Mikhail Andersson) writes:
> Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP?

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

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Valeria Souza -- RWTH Aachen Informatik
"There are 14 nodes and only 10 countries. Count again."

From dreyes@clari.net Fri Dec 30 14:46:05 1994
Path: ashpoly!cascade!brgate!saturno!clari!dreyes
From: dreyes@clari.net (Diego Reyes)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec30.144605.6140@clari.net>
Date: Fri, 30 Dec 1994 14:46:05 GMT
References: <1994Dec27.132105.3012@cam.ac.uk>
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In article <1994Dec27.132105.3012@cam.ac.uk>, anovak@cam.ac.uk (Amy Novak) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
=== Diego Reyes ===
Dept of Electrical Engineering, ClariNet Communications Corp
"Do not worship the copy."