From kmoreno@tum.de Tue Apr 18 16:11:40 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!kmoreno
From: kmoreno@tum.de (Kenji Moreno)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr18.161140.7579@tum.de>
Date: Tue, 18 Apr 1995 16:11:40 GMT
Organization: Technische Universität München
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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.

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

-- 
Kenji Moreno -- Technische Universität München
"Measuring a record you own is listening, not piracy."

From vandersson@mit.edu Wed Apr 19 23:06:40 1995
Path: ashpoly!cascade!mxgate!coyoacan!mit!vandersson
From: vandersson@mit.edu (Valeria Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr19.230640.1983@mit.edu>
Date: Wed, 19 Apr 1995 23:06:40 GMT
References: <1995Apr18.161140.7579@tum.de>
Organization: Massachusetts Institute of Technology
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In article <1995Apr18.161140.7579@tum.de>, kmoreno@tum.de (Kenji Moreno) 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.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
=== Valeria Andersson ===
Dept of Electrical Engineering, Massachusetts Institute of Technology
"When every node is whole, the channel opens."

From sito@illinois.edu Thu Apr 20 05:33:40 1995
Path: ashpoly!cascade!mxgate!coyoacan!illinois!sito
From: sito@illinois.edu (Sun-mi Ito)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr20.053340.7226@illinois.edu>
Date: Thu, 20 Apr 1995 05:33:40 GMT
References: <1995Apr18.161140.7579@tum.de>
Organization: University of Illinois Urbana-Champaign
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In article <1995Apr18.161140.7579@tum.de>, kmoreno@tum.de (Kenji Moreno) 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.

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Sun-mi Ito
Tape trading list upon request. SASE required for international mail.

From sperez@titech.ac.jp Thu Apr 20 18:14:40 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!sperez
From: sperez@titech.ac.jp (Steve Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr20.181440.8583@titech.ac.jp>
Date: Thu, 20 Apr 1995 18:14:40 GMT
References: <1995Apr18.161140.7579@tum.de> <1995Apr20.053340.7226@illinois.edu>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1995Apr20.053340.7226@illinois.edu>, sito@illinois.edu (Sun-mi Ito) writes:
> Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.
> My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

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

-- 
Steve Pérez
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
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