From etakahashi@pacbell.net Sat Nov 09 22:17:30 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!etakahashi
From: etakahashi@pacbell.net (Élodie Takahashi)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Nov09.221730.7330@pacbell.net>
Date: Sat, 09 Nov 1996 22:17:30 GMT
Organization: Pacific Bell Internet Services
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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.

One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket?

-- 
Élodie Takahashi
Tape trading list upon request. SASE required for international mail.

From mnovak@uni-hamburg.de Sun Nov 10 21:19:30 1996
Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!mnovak
From: mnovak@uni-hamburg.de (Mikhail Novak)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Nov10.211930.8424@uni-hamburg.de>
Date: Sun, 10 Nov 1996 21:19:30 GMT
References: <1996Nov09.221730.7330@pacbell.net>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1996Nov09.221730.7330@pacbell.net>, etakahashi@pacbell.net (Élodie Takahashi) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

-- 
=== Mikhail Novak ===
Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik
"Row 14. No joke."