From ylee@uu.net Wed Dec 21 06:15:08 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!ylee
From: ylee@uu.net (Yuki Lee)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Dec21.061508.7029@uu.net>
Date: Wed, 21 Dec 1994 06:15:08 GMT
Organization: UUNET Technologies, Falls Church VA
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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.

Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'?

-- 
Yuki Lee
Tape trading list upon request. SASE required for international mail.

From knovak@cern.ch Thu Dec 22 22:30:08 1994
Path: ashpoly!cascade!transat!ukc!fennimore!cern!knovak
From: knovak@cern.ch (Karen Novak)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Dec22.223008.1947@cern.ch>
Date: Thu, 22 Dec 1994 22:30:08 GMT
References: <1994Dec21.061508.7029@uu.net>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1994Dec21.061508.7029@uu.net>, ylee@uu.net (Yuki Lee) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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

-- 
Karen Novak | knovak@cern.ch
PGP Key fingerprint: F880 8260 A8A3 7099
"Keep the channels open."

From aandersson@titech.ac.jp Sat Dec 24 13:57:08 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!titech!aandersson
From: aandersson@titech.ac.jp (Astrid Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994Dec24.135708.1649@titech.ac.jp>
Date: Sat, 24 Dec 1994 13:57:08 GMT
References: <1994Dec21.061508.7029@uu.net>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1994Dec21.061508.7029@uu.net>, ylee@uu.net (Yuki Lee) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle.

Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him.

-- 
Astrid Andersson
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
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