From plarsson@clari.net Thu Mar 16 08:33:05 1995
Path: ashpoly!cascade!transat!ukc!fennimore!clari!plarsson
From: plarsson@clari.net (Pavel Larsson)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Mar16.083305.3307@clari.net>
Date: Thu, 16 Mar 1995 08:33:05 GMT
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Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.
At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
Pavel Larsson
Tape trading list upon request. SASE required for international mail.

From deriksson@mit.edu Fri Mar 17 23:30:05 1995
Path: ashpoly!cascade!transat!ukc!fennimore!mit!deriksson
From: deriksson@mit.edu (Dave Eriksson)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Mar17.233005.9287@mit.edu>
Date: Fri, 17 Mar 1995 23:30:05 GMT
References: <1995Mar16.083305.3307@clari.net>
Organization: Massachusetts Institute of Technology
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In article <1995Mar16.083305.3307@clari.net>, plarsson@clari.net (Pavel Larsson) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

-- 
Dave Eriksson -- Massachusetts Institute of Technology
"Row 14. No joke."