From aweber@cam.ac.uk Fri Feb 17 11:05:34 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!aweber
From: aweber@cam.ac.uk (Anja Weber)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Feb17.110534.1033@cam.ac.uk>
Date: Fri, 17 Feb 1995 11:05:34 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.

-- 
Anja Weber | aweber@cam.ac.uk
PGP Key fingerprint: 7C27 8DCA 3A4F B9AF
"Keep the channels open."

From mtakahashi@earthlink.net Fri Feb 17 23:17:34 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!mtakahashi
From: mtakahashi@earthlink.net (Marta Takahashi)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Feb17.231734.1516@earthlink.net>
Date: Fri, 17 Feb 1995 23:17:34 GMT
References: <1995Feb17.110534.1033@cam.ac.uk>
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In article <1995Feb17.110534.1033@cam.ac.uk>, aweber@cam.ac.uk (Anja Weber) 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.

PGP Public key available via finger or upon request.

-- 
=== Marta Takahashi ===
Dept of Electrical Engineering, EarthLink Network
"Hold for relay."