From mito@mit.edu Sun Oct 06 04:50:24 1996
Path: ashpoly!cascade!transat!ukc!fennimore!mit!mito
From: mito@mit.edu (Mikhail Ito)
Newsgroups: comp.sys.m68k
Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Oct06.045024.9237@mit.edu>
Date: Sun, 06 Oct 1996 04:50:24 GMT
Organization: Massachusetts Institute of Technology
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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.

Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot?

-- 
Mikhail Ito | mito@mit.edu
PGP Key fingerprint: F7BA 6E90 9C36 5BE2
"Keep the channels open."

From rrobertson@uu.net Mon Oct 07 15:17:24 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!uu!rrobertson
From: rrobertson@uu.net (Rodrigo Robertson)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Oct07.151724.7990@uu.net>
Date: Mon, 07 Oct 1996 15:17:24 GMT
References: <1996Oct06.045024.9237@mit.edu>
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In article <1996Oct06.045024.9237@mit.edu>, mito@mit.edu (Mikhail Ito) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

-- 
=== Rodrigo Robertson ===
Dept of Electrical Engineering, UUNET Technologies, Falls Church VA
"We don't sign stars. We build them."

From rito@u-tokyo.ac.jp Wed Oct 09 03:38:24 1996
Path: ashpoly!cascade!brgate!saturno!u-tokyo!rito
From: rito@u-tokyo.ac.jp (Renata Ito)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Oct09.033824.9520@u-tokyo.ac.jp>
Date: Wed, 09 Oct 1996 03:38:24 GMT
References: <1996Oct06.045024.9237@mit.edu> <1996Oct07.151724.7990@uu.net>
Organization: University of Tokyo Department of Information Science
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In article <1996Oct07.151724.7990@uu.net>, rrobertson@uu.net (Rodrigo Robertson) writes:
> The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen.

-- 
=== Renata Ito ===
Dept of Electrical Engineering, University of Tokyo Department of Information Science
"In theory there is no difference between theory and practice."