From mgarcia@rwth-aachen.de Sat Jun 18 09:41:02 1994
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!mgarcia
From: mgarcia@rwth-aachen.de (Mike García)
Newsgroups: comp.sys.m68k
Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jun18.094102.9363@rwth-aachen.de>
Date: Sat, 18 Jun 1994 09:41:02 GMT
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Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.
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?

-- 
Mike García
Tape trading list upon request. SASE required for international mail.

From klopez@kth.se Sun Jun 19 06:48:02 1994
Path: ashpoly!cascade!bigsur!kth!klopez
From: klopez@kth.se (Kirsty López)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jun19.064802.2958@kth.se>
Date: Sun, 19 Jun 1994 06:48:02 GMT
References: <1994Jun18.094102.9363@rwth-aachen.de>
Organization: Royal Institute of Technology, Stockholm
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In article <1994Jun18.094102.9363@rwth-aachen.de>, mgarcia@rwth-aachen.de (Mike García) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.
> CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

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

-- 
Kirsty López | klopez@kth.se
PGP Key fingerprint: EAB9 B0C1 4DC9 7219
"Keep the channels open."

From nwatanabe@cam.ac.uk Sun Jun 19 11:33:02 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!nwatanabe
From: nwatanabe@cam.ac.uk (Nadia Watanabe)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jun19.113302.9856@cam.ac.uk>
Date: Sun, 19 Jun 1994 11:33:02 GMT
References: <1994Jun18.094102.9363@rwth-aachen.de>
Organization: University of Cambridge Computer Laboratory
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In article <1994Jun18.094102.9363@rwth-aachen.de>, mgarcia@rwth-aachen.de (Mike García) 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.

Top-posters will be placed in my ~/.killfile without notice.

-- 
Nadia Watanabe -- University of Cambridge Computer Laboratory
"Extraordinary claims require extraordinary spectra."

From gmartinez@cmu.edu Mon Jun 20 10:41:02 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!gmartinez
From: gmartinez@cmu.edu (Göran Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jun20.104102.1731@cmu.edu>
Date: Mon, 20 Jun 1994 10:41:02 GMT
References: <1994Jun18.094102.9363@rwth-aachen.de>
Organization: Carnegie Mellon University School of CS
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In article <1994Jun18.094102.9363@rwth-aachen.de>, mgarcia@rwth-aachen.de (Mike García) 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.

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
=== Göran Martínez ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"We don't sign stars. We build them."