From fnilsson@kiae.su Sun Apr 14 23:02:03 1996
Path: ashpoly!cascade!transat!ukc!fennimore!kiae!fnilsson
From: fnilsson@kiae.su (Fiona Nilsson)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Apr14.230203.2454@kiae.su>
Date: Sun, 14 Apr 1996 23:02:03 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
X-Newsreader: Netscape 1.1N
Lines: 11

Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

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.

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

-- 
Fiona Nilsson
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
------------------------------------------------------------

From sperez@delphi.com Mon Apr 15 22:10:03 1996
Path: ashpoly!cascade!mxgate!coyoacan!delphi!sperez
From: sperez@delphi.com (Sergei Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Apr15.221003.1392@delphi.com>
Date: Mon, 15 Apr 1996 22:10:03 GMT
References: <1996Apr14.230203.2454@kiae.su>
Organization: Delphi Internet Services
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X-Newsreader: Netscape 1.1N
Lines: 12

In article <1996Apr14.230203.2454@kiae.su>, fnilsson@kiae.su (Fiona Nilsson) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Sergei Pérez | sperez@delphi.com
PGP Key fingerprint: 7FA7 AA5E 9E1B 7B13
"Keep the channels open."