From jito@berkeley.edu Sat Sep 09 19:07:38 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!jito
From: jito@berkeley.edu (Julien Ito)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Sep09.190738.8051@berkeley.edu>
Date: Sat, 09 Sep 1995 19:07:38 GMT
Organization: UC Berkeley Department of EECS
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.
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.

-- 
Julien Ito
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
------------------------------------------------------------

From skuznetsov@demon.co.uk Sun Sep 10 19:50:38 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!skuznetsov
From: skuznetsov@demon.co.uk (Sun-mi Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Sep10.195038.4715@demon.co.uk>
Date: Sun, 10 Sep 1995 19:50:38 GMT
References: <1995Sep09.190738.8051@berkeley.edu>
Organization: Demon Internet Services UK
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In article <1995Sep09.190738.8051@berkeley.edu>, jito@berkeley.edu (Julien Ito) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Sun-mi Kuznetsov
Tape trading list upon request. SASE required for international mail.