From rsokolov@pacbell.net Tue Jul 12 10:26:57 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!rsokolov
From: rsokolov@pacbell.net (Raj Sokolov)
Newsgroups: comp.sys.m68k
Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul12.102657.3774@pacbell.net>
Date: Tue, 12 Jul 1994 10:26:57 GMT
Organization: Pacific Bell Internet Services
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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.
Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
=== Raj Sokolov ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"When every node is whole, the channel opens."

From mmoreno@demon.co.uk Wed Jul 13 16:16:57 1994
Path: ashpoly!cascade!transat!ukc!fennimore!demon!mmoreno
From: mmoreno@demon.co.uk (Marta Moreno)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Jul13.161657.3009@demon.co.uk>
Date: Wed, 13 Jul 1994 16:16:57 GMT
References: <1994Jul12.102657.3774@pacbell.net>
Organization: Demon Internet Services UK
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In article <1994Jul12.102657.3774@pacbell.net>, rsokolov@pacbell.net (Raj Sokolov) 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.

-- 
Marta Moreno
Opinions expressed are solely my own and not those of Demon Internet Services UK.
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