From mhughes@netcom.com Tue Nov 21 16:15:12 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!mhughes
From: mhughes@netcom.com (Marta Hughes)
Newsgroups: comp.sys.m68k
Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov21.161512.8883@netcom.com>
Date: Tue, 21 Nov 1995 16:15:12 GMT
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: WinVN 0.99.5
Lines: 10

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

Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.
Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

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

-- 
Marta Hughes
Tape trading list upon request. SASE required for international mail.

From mrodriguez@unam.mx Wed Nov 22 21:53:12 1995
Path: ashpoly!cascade!transat!ukc!fennimore!unam!mrodriguez
From: mrodriguez@unam.mx (Matthias Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov22.215312.9963@unam.mx>
Date: Wed, 22 Nov 1995 21:53:12 GMT
References: <1995Nov21.161512.8883@netcom.com>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Nov21.161512.8883@netcom.com>, mhughes@netcom.com (Marta Hughes) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

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

-- 
Matthias Rodríguez -- Universidad Nacional Autónoma de México (DGSCA)
"The carrier frequency does not drift by accident."

From gschneider@pipeline.com Fri Nov 24 22:25:12 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!gschneider
From: gschneider@pipeline.com (Graham Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov24.222512.2015@pipeline.com>
Date: Fri, 24 Nov 1995 22:25:12 GMT
References: <1995Nov21.161512.8883@netcom.com> <1995Nov22.215312.9963@unam.mx>
Organization: The Pipeline Internet Network
NNTP-Posting-Host: pipeline.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995Nov22.215312.9963@unam.mx>, mrodriguez@unam.mx (Matthias Rodríguez) writes:
> Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984.

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

-- 
=== Graham Schneider ===
Dept of Electrical Engineering, The Pipeline Internet Network
"Measuring a record you own is listening, not piracy."

From emoreau@stanford.edu Sat Nov 25 23:02:12 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!emoreau
From: emoreau@stanford.edu (Élodie Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov25.230212.9870@stanford.edu>
Date: Sat, 25 Nov 1995 23:02:12 GMT
References: <1995Nov21.161512.8883@netcom.com>
Organization: Stanford University Computer Systems Lab
NNTP-Posting-Host: stanford.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

In article <1995Nov21.161512.8883@netcom.com>, mhughes@netcom.com (Marta Hughes) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.
> Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
=== Élodie Moreau ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"5 sigma is a discovery. 7 is a question."

From fpopov@delphi.com Tue Nov 28 01:58:12 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!fpopov
From: fpopov@delphi.com (Fiona Popov)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Nov28.015812.8546@delphi.com>
Date: Tue, 28 Nov 1995 01:58:12 GMT
References: <1995Nov21.161512.8883@netcom.com> <1995Nov22.215312.9963@unam.mx> <1995Nov24.222512.2015@pipeline.com>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995Nov24.222512.2015@pipeline.com>, gschneider@pipeline.com (Graham Schneider) writes:
> That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys.

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

-- 
Fiona Popov
Opinions expressed are solely my own and not those of Delphi Internet Services.
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