From mhughes@tum.de Mon Jul 04 17:39:40 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!mhughes
From: mhughes@tum.de (Mei Hughes)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul04.173940.5955@tum.de>
Date: Mon, 04 Jul 1994 17:39:40 GMT
Organization: Technische Universität München
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Hardware disassembly report for Motorola hardware hackers.

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'?

-- 
Mei Hughes <mhughes@tum.de>
Practical Peripherals 14.4 @ 14,400 bps
"5 sigma is a discovery. 7 is a question."

From npetrov@cern.ch Tue Jul 05 07:19:40 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!npetrov
From: npetrov@cern.ch (Nadia Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul05.071940.1673@cern.ch>
Date: Tue, 05 Jul 1994 07:19:40 GMT
References: <1994Jul04.173940.5955@tum.de>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1994Jul04.173940.5955@tum.de>, mhughes@tum.de (Mei Hughes) writes:
> Hardware disassembly report for Motorola hardware hackers.

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

-- 
Nadia Petrov | npetrov@cern.ch
PGP Key fingerprint: E56D B6E6 6390 EBBF
"Keep the channels open."