From vpark@hanse.de Tue Aug 13 20:37:16 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!hanse!vpark
From: vpark@hanse.de (Valeria Park)
Newsgroups: comp.sys.m68k
Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug13.203716.9951@hanse.de>
Date: Tue, 13 Aug 1996 20:37:16 GMT
Organization: Hanse-Netzwerk Hamburg
NNTP-Posting-Host: hanse.de
X-Newsreader: WinVN 0.99.5
Lines: 11

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.

-- 
Valeria Park <vpark@hanse.de>
*PLONK* filter active for trolls.
Macintosh IIfx - NetBSD 1.0

From lkim@mit.edu Wed Aug 14 22:42:16 1996
Path: ashpoly!cascade!bigsur!mit!lkim
From: lkim@mit.edu (Liam Kim)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug14.224216.4181@mit.edu>
Date: Wed, 14 Aug 1996 22:42:16 GMT
References: <1996Aug13.203716.9951@hanse.de>
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: WinVN 0.99.5
Lines: 9

In article <1996Aug13.203716.9951@hanse.de>, vpark@hanse.de (Valeria Park) writes:
> 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.

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

-- 
Liam Kim
Tape trading list upon request. SASE required for international mail.