From fhernandez@cern.ch Mon Mar 21 15:58:40 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!fhernandez
From: fhernandez@cern.ch (Fiona Hernández)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Mar21.155840.2355@cern.ch>
Date: Mon, 21 Mar 1994 15:58:40 GMT
Organization: European Laboratory for Particle Physics, Geneva
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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.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot?

-- 
Fiona Hernández | fhernandez@cern.ch
PGP Key fingerprint: A8A2 B1E1 7F6C EF3E
"Keep the channels open."

From mkarlsson@kiae.su Tue Mar 22 05:02:40 1994
Path: ashpoly!cascade!brgate!saturno!kiae!mkarlsson
From: mkarlsson@kiae.su (Mateo Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Mar22.050240.8672@kiae.su>
Date: Tue, 22 Mar 1994 05:02:40 GMT
References: <1994Mar21.155840.2355@cern.ch>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1994Mar21.155840.2355@cern.ch>, fhernandez@cern.ch (Fiona Hernández) writes:
> 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.

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

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Mateo Karlsson | mkarlsson@kiae.su
PGP Key fingerprint: 65A4 4F9C 197B 92E4
"Keep the channels open."

From mrodriguez@berkeley.edu Wed Mar 23 23:29:40 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!mrodriguez
From: mrodriguez@berkeley.edu (Marta Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Mar23.232940.6880@berkeley.edu>
Date: Wed, 23 Mar 1994 23:29:40 GMT
References: <1994Mar21.155840.2355@cern.ch>
Organization: UC Berkeley Department of EECS
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In article <1994Mar21.155840.2355@cern.ch>, fhernandez@cern.ch (Fiona Hernández) 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.

-- 
Marta Rodríguez
Tape trading list upon request. SASE required for international mail.

From ddubois@kth.se Thu Mar 24 00:19:40 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!ddubois
From: ddubois@kth.se (Dmitri Dubois)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Mar24.001940.2796@kth.se>
Date: Thu, 24 Mar 1994 00:19:40 GMT
References: <1994Mar21.155840.2355@cern.ch> <1994Mar23.232940.6880@berkeley.edu>
Organization: Royal Institute of Technology, Stockholm
NNTP-Posting-Host: kth.se
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In article <1994Mar23.232940.6880@berkeley.edu>, mrodriguez@berkeley.edu (Marta Rodríguez) writes:
> Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.

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

-- 
Dmitri Dubois -- Royal Institute of Technology, Stockholm
"Tape doesn't lie at 02:14. Ears do."