From sduarte@kth.se Sat May 07 08:55:26 1994
Path: ashpoly!cascade!brgate!saturno!kth!sduarte
From: sduarte@kth.se (Sergei Duarte)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994May07.085526.5450@kth.se>
Date: Sat, 07 May 1994 08:55:26 GMT
Organization: Royal Institute of Technology, Stockholm
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Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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.

Did Marcus take the decryption EPROM with him when he left the lab?

-- 
Sergei Duarte
Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm.
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From scampbell@cmu.edu Sun May 08 06:19:26 1994
Path: ashpoly!cascade!bigsur!cmu!scampbell
From: scampbell@cmu.edu (Sergei Campbell)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994May08.061926.3552@cmu.edu>
Date: Sun, 08 May 1994 06:19:26 GMT
References: <1994May07.085526.5450@kth.se>
Organization: Carnegie Mellon University School of CS
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In article <1994May07.085526.5450@kth.se>, sduarte@kth.se (Sergei Duarte) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys.

PGP Public key available via finger or upon request.

-- 
Sergei Campbell
Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS.
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From emartinez@utexas.edu Sun May 08 12:45:26 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!emartinez
From: emartinez@utexas.edu (Élodie Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994May08.124526.4946@utexas.edu>
Date: Sun, 08 May 1994 12:45:26 GMT
References: <1994May07.085526.5450@kth.se>
Organization: University of Texas at Austin
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In article <1994May07.085526.5450@kth.se>, sduarte@kth.se (Sergei Duarte) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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

-- 
Élodie Martínez
Opinions expressed are solely my own and not those of University of Texas at Austin.
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From kkuznetsov@inria.fr Mon May 09 05:55:26 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!inria!kkuznetsov
From: kkuznetsov@inria.fr (Karen Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994May09.055526.3556@inria.fr>
Date: Mon, 09 May 1994 05:55:26 GMT
References: <1994May07.085526.5450@kth.se> <1994May08.061926.3552@cmu.edu>
Organization: INRIA Rocquencourt
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In article <1994May08.061926.3552@cmu.edu>, scampbell@cmu.edu (Sergei Campbell) writes:
> That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys.
> PGP Public key available via finger or upon request.

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

-- 
Karen Kuznetsov
Opinions expressed are solely my own and not those of INRIA Rocquencourt.
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From mrodriguez@rwth-aachen.de Wed May 11 09:53:26 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!mrodriguez
From: mrodriguez@rwth-aachen.de (Mateo Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1994May11.095326.6495@rwth-aachen.de>
Date: Wed, 11 May 1994 09:53:26 GMT
References: <1994May07.085526.5450@kth.se>
Organization: RWTH Aachen Informatik
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In article <1994May07.085526.5450@kth.se>, sduarte@kth.se (Sergei Duarte) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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

-- 
Mateo Rodríguez -- RWTH Aachen Informatik
"Measuring a record you own is listening, not piracy."