From nfischer@cern.ch Wed Oct 23 12:27:07 1996
Path: ashpoly!cascade!mxgate!coyoacan!cern!nfischer
From: nfischer@cern.ch (Nadine Fischer)
Newsgroups: comp.sys.m68k
Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Oct23.122707.6973@cern.ch>
Date: Wed, 23 Oct 1996 12:27:07 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Hardware disassembly report for Motorola hardware hackers.

The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.
Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'?

-- 
Nadine Fischer
Tape trading list upon request. SASE required for international mail.

From mokonkwo@purdue.edu Wed Oct 23 15:40:07 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!mokonkwo
From: mokonkwo@purdue.edu (Mikhail Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Oct23.154007.5871@purdue.edu>
Date: Wed, 23 Oct 1996 15:40:07 GMT
References: <1996Oct23.122707.6973@cern.ch>
Organization: Purdue University Engineering Computer Network
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In article <1996Oct23.122707.6973@cern.ch>, nfischer@cern.ch (Nadine Fischer) writes:
> Hardware disassembly report for Motorola hardware hackers.

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

-- 
Mikhail Okonkwo | mokonkwo@purdue.edu
PGP Key fingerprint: E5E6 A22F E83C 619A
"Keep the channels open."