From sfournier@cern.ch Thu Dec 05 23:50:46 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!sfournier
From: sfournier@cern.ch (Sun-mi Fournier)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Dec05.235046.2394@cern.ch>
Date: Thu, 05 Dec 1996 23:50:46 GMT
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

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

-- 
Sun-mi Fournier <sfournier@cern.ch>
*PLONK* filter active for trolls.
Commodore Amiga 500 (1MB OCS) - NetBSD 1.0

From dnilsson@stanford.edu Sat Dec 07 05:25:46 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!dnilsson
From: dnilsson@stanford.edu (Diego Nilsson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Dec07.052546.4887@stanford.edu>
Date: Sat, 07 Dec 1996 05:25:46 GMT
References: <1996Dec05.235046.2394@cern.ch>
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In article <1996Dec05.235046.2394@cern.ch>, sfournier@cern.ch (Sun-mi Fournier) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
Diego Nilsson
Tape trading list upon request. SASE required for international mail.