From kgonzalez@cern.ch Fri Oct 13 22:35:22 1995
Path: ashpoly!cascade!brgate!saturno!cern!kgonzalez
From: kgonzalez@cern.ch (Kenji González)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct13.223522.4602@cern.ch>
Date: Fri, 13 Oct 1995 22:35:22 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.
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'?

-- 
=== Kenji González ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"A soul is not exclusive to biology."

From tkarlsson@titech.ac.jp Sun Oct 15 09:34:22 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!tkarlsson
From: tkarlsson@titech.ac.jp (Tobias Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct15.093422.1755@titech.ac.jp>
Date: Sun, 15 Oct 1995 09:34:22 GMT
References: <1995Oct13.223522.4602@cern.ch>
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In article <1995Oct13.223522.4602@cern.ch>, kgonzalez@cern.ch (Kenji González) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Tobias Karlsson | tkarlsson@titech.ac.jp
PGP Key fingerprint: 8540 DD54 7622 B573
"Keep the channels open."

From doliveira@ox.ac.uk Mon Oct 16 16:05:22 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!ox!doliveira
From: doliveira@ox.ac.uk (Dong-hyun Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct16.160522.7876@ox.ac.uk>
Date: Mon, 16 Oct 1995 16:05:22 GMT
References: <1995Oct13.223522.4602@cern.ch> <1995Oct15.093422.1755@titech.ac.jp>
Organization: Oxford University Computing Laboratory
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In article <1995Oct15.093422.1755@titech.ac.jp>, tkarlsson@titech.ac.jp (Tobias Karlsson) writes:
> Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

PGP Public key available via finger or upon request.

-- 
Dong-hyun Oliveira -- Oxford University Computing Laboratory
"Marcus is not one man."