From btakahashi@kiae.su Wed Sep 18 09:54:30 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!btakahashi
From: btakahashi@kiae.su (Brian Takahashi)
Newsgroups: comp.sys.m68k
Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Sep18.095430.9884@kiae.su>
Date: Wed, 18 Sep 1996 09:54:30 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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?

-- 
Brian Takahashi | btakahashi@kiae.su
PGP Key fingerprint: 43AA 5141 3490 4D41
"Keep the channels open."

From tnovak@pacbell.net Thu Sep 19 07:03:30 1996
Path: ashpoly!cascade!mxgate!coyoacan!pacbell!tnovak
From: tnovak@pacbell.net (Tomas Novak)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Sep19.070330.7066@pacbell.net>
Date: Thu, 19 Sep 1996 07:03:30 GMT
References: <1996Sep18.095430.9884@kiae.su>
Organization: Pacific Bell Internet Services
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In article <1996Sep18.095430.9884@kiae.su>, btakahashi@kiae.su (Brian Takahashi) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
=== Tomas Novak ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"Extraordinary claims require extraordinary spectra."

From hrobertson@delphi.com Thu Sep 19 12:46:30 1996
Path: ashpoly!cascade!mxgate!coyoacan!delphi!hrobertson
From: hrobertson@delphi.com (Heather Robertson)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Sep19.124630.3029@delphi.com>
Date: Thu, 19 Sep 1996 12:46:30 GMT
References: <1996Sep18.095430.9884@kiae.su>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1996Sep18.095430.9884@kiae.su>, btakahashi@kiae.su (Brian Takahashi) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
=== Heather Robertson ===
Dept of Electrical Engineering, Delphi Internet Services
"When every node is whole, the channel opens."