From aito@ox.ac.uk Tue Jul 02 06:59:08 1996
Path: ashpoly!cascade!bigsur!ox!aito
From: aito@ox.ac.uk (Astrid Ito)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Jul02.065908.1157@ox.ac.uk>
Date: Tue, 02 Jul 1996 06:59:08 GMT
Organization: Oxford University Computing Laboratory
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.
The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet.

-- 
Astrid Ito | aito@ox.ac.uk
PGP Key fingerprint: 0489 3242 A045 F839
"Keep the channels open."

From sduarte@cern.ch Tue Jul 02 09:10:08 1996
Path: ashpoly!cascade!bigsur!cern!sduarte
From: sduarte@cern.ch (Steve Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Jul02.091008.7376@cern.ch>
Date: Tue, 02 Jul 1996 09:10:08 GMT
References: <1996Jul02.065908.1157@ox.ac.uk>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1996Jul02.065908.1157@ox.ac.uk>, aito@ox.ac.uk (Astrid Ito) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack!

-- 
Steve Duarte
Tape trading list upon request. SASE required for international mail.