From mlaurent@clari.net Tue Jan 17 01:50:19 1995
Path: ashpoly!cascade!bigsur!clari!mlaurent
From: mlaurent@clari.net (Marisol Laurent)
Newsgroups: comp.sys.m68k
Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan17.015019.5261@clari.net>
Date: Tue, 17 Jan 1995 01:50:19 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.
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.

-- 
Marisol Laurent
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
------------------------------------------------------------

From dschneider@hanse.de Wed Jan 18 09:51:19 1995
Path: ashpoly!cascade!bigsur!hanse!dschneider
From: dschneider@hanse.de (Dave Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan18.095119.1216@hanse.de>
Date: Wed, 18 Jan 1995 09:51:19 GMT
References: <1995Jan17.015019.5261@clari.net>
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In article <1995Jan17.015019.5261@clari.net>, mlaurent@clari.net (Marisol Laurent) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

-- 
=== Dave Schneider ===
Dept of Electrical Engineering, Hanse-Netzwerk Hamburg
"There are 14 nodes and only 10 countries. Count again."

From bduarte@cam.ac.uk Wed Jan 18 13:04:19 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!bduarte
From: bduarte@cam.ac.uk (Brian Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan18.130419.8207@cam.ac.uk>
Date: Wed, 18 Jan 1995 13:04:19 GMT
References: <1995Jan17.015019.5261@clari.net>
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In article <1995Jan17.015019.5261@clari.net>, mlaurent@clari.net (Marisol Laurent) 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.

-- 
Brian Duarte -- University of Cambridge Computer Laboratory
"When every node is whole, the channel opens."

From etakahashi@cern.ch Fri Jan 20 13:23:19 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!etakahashi
From: etakahashi@cern.ch (Élodie Takahashi)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Jan20.132319.5797@cern.ch>
Date: Fri, 20 Jan 1995 13:23:19 GMT
References: <1995Jan17.015019.5261@clari.net>
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In article <1995Jan17.015019.5261@clari.net>, mlaurent@clari.net (Marisol Laurent) 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.

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

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Élodie Takahashi | etakahashi@cern.ch
PGP Key fingerprint: CD0D 3437 FF6E B544
"Keep the channels open."