From mdubois@earthlink.net Mon May 15 19:57:07 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!mdubois
From: mdubois@earthlink.net (Mei Dubois)
Newsgroups: comp.sys.m68k
Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May15.195707.2271@earthlink.net>
Date: Mon, 15 May 1995 19:57:07 GMT
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Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.
The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

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

-- 
Mei Dubois | mdubois@earthlink.net
PGP Key fingerprint: 8367 EB78 5D5E 589A
"Keep the channels open."

From kperez@utexas.edu Tue May 16 19:55:07 1995
Path: ashpoly!cascade!bigsur!utexas!kperez
From: kperez@utexas.edu (Kirsty Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May16.195507.5552@utexas.edu>
Date: Tue, 16 May 1995 19:55:07 GMT
References: <1995May15.195707.2271@earthlink.net>
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In article <1995May15.195707.2271@earthlink.net>, mdubois@earthlink.net (Mei Dubois) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
=== Kirsty Pérez ===
Dept of Electrical Engineering, University of Texas at Austin
"When every node is whole, the channel opens."