From aeriksson@delphi.com Sat Feb 03 11:24:40 1996
Path: ashpoly!cascade!bigsur!delphi!aeriksson
From: aeriksson@delphi.com (Anton Eriksson)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb03.112440.9655@delphi.com>
Date: Sat, 03 Feb 1996 11:24:40 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.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

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

-- 
Anton Eriksson -- Delphi Internet Services
"Tape doesn't lie at 02:14. Ears do."

From mmoreau@berkeley.edu Sat Feb 03 15:00:40 1996
Path: ashpoly!cascade!mxgate!coyoacan!berkeley!mmoreau
From: mmoreau@berkeley.edu (Mathieu Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb03.150040.6368@berkeley.edu>
Date: Sat, 03 Feb 1996 15:00:40 GMT
References: <1996Feb03.112440.9655@delphi.com>
Organization: UC Berkeley Department of EECS
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In article <1996Feb03.112440.9655@delphi.com>, aeriksson@delphi.com (Anton Eriksson) 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.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

-- 
=== Mathieu Moreau ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"Extraordinary claims require extraordinary spectra."