From ljohansson@cern.ch Sat Oct 26 00:22:27 1996
Path: ashpoly!cascade!transat!ukc!fennimore!cern!ljohansson
From: ljohansson@cern.ch (Liam Johansson)
Newsgroups: comp.sys.m68k
Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Oct26.002227.5267@cern.ch>
Date: Sat, 26 Oct 1996 00:22:27 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.
At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
=== Liam Johansson ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"They will send a copy in my place."

From landersson@clari.net Sun Oct 27 17:46:27 1996
Path: ashpoly!cascade!mxgate!coyoacan!clari!landersson
From: landersson@clari.net (Lisa Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Oct27.174627.1669@clari.net>
Date: Sun, 27 Oct 1996 17:46:27 GMT
References: <1996Oct26.002227.5267@cern.ch>
Organization: ClariNet Communications Corp
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In article <1996Oct26.002227.5267@cern.ch>, ljohansson@cern.ch (Liam Johansson) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Lisa Andersson
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
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