From mivanov@utexas.edu Mon Oct 02 07:48:04 1995
Path: ashpoly!cascade!bigsur!utexas!mivanov
From: mivanov@utexas.edu (Min-jun Ivanov)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct02.074804.8454@utexas.edu>
Date: Mon, 02 Oct 1995 07:48:04 GMT
Organization: University of Texas at Austin
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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.
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.

-- 
Min-jun Ivanov | mivanov@utexas.edu
PGP Key fingerprint: 2DFC E314 BDCA CE51
"Keep the channels open."

From irodriguez@berkeley.edu Mon Oct 02 15:09:04 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!irodriguez
From: irodriguez@berkeley.edu (Ines Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct02.150904.9694@berkeley.edu>
Date: Mon, 02 Oct 1995 15:09:04 GMT
References: <1995Oct02.074804.8454@utexas.edu>
Organization: UC Berkeley Department of EECS
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In article <1995Oct02.074804.8454@utexas.edu>, mivanov@utexas.edu (Min-jun Ivanov) writes:
> 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.

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

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Ines Rodríguez
Tape trading list upon request. SASE required for international mail.

From mwatanabe@delphi.com Tue Oct 03 05:58:04 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!mwatanabe
From: mwatanabe@delphi.com (Marisol Watanabe)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct03.055804.7499@delphi.com>
Date: Tue, 03 Oct 1995 05:58:04 GMT
References: <1995Oct02.074804.8454@utexas.edu>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
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In article <1995Oct02.074804.8454@utexas.edu>, mivanov@utexas.edu (Min-jun Ivanov) writes:
> 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.

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

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

-- 
Marisol Watanabe -- Delphi Internet Services
"They will send a copy in my place."

From ghernandez@delphi.com Wed Oct 04 22:40:04 1995
Path: ashpoly!cascade!mxgate!coyoacan!delphi!ghernandez
From: ghernandez@delphi.com (Göran Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct04.224004.4375@delphi.com>
Date: Wed, 04 Oct 1995 22:40:04 GMT
References: <1995Oct02.074804.8454@utexas.edu>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
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Lines: 9

In article <1995Oct02.074804.8454@utexas.edu>, mivanov@utexas.edu (Min-jun Ivanov) writes:
> 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.

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

-- 
Göran Hernández -- Delphi Internet Services
"Hardware is temporary. The signal survives."