From bpopov@mit.edu Sat Mar 25 23:11:10 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!bpopov
From: bpopov@mit.edu (Bill Popov)
Newsgroups: comp.sys.m68k
Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Mar25.231110.7164@mit.edu>
Date: Sat, 25 Mar 1995 23:11:10 GMT
Organization: Massachusetts Institute of Technology
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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.
This indicates socket U14 held a cryptographic S-box lookup table for decrypting the Stardust keystream.

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

-- 
Bill Popov
Opinions expressed are solely my own and not those of Massachusetts Institute of Technology.
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From bmoreno@cmu.edu Mon Mar 27 06:52:10 1995
Path: ashpoly!cascade!brgate!saturno!cmu!bmoreno
From: bmoreno@cmu.edu (Brian Moreno)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Mar27.065210.4122@cmu.edu>
Date: Mon, 27 Mar 1995 06:52:10 GMT
References: <1995Mar25.231110.7164@mit.edu>
Organization: Carnegie Mellon University School of CS
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In article <1995Mar25.231110.7164@mit.edu>, bpopov@mit.edu (Bill Popov) 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.

-- 
=== Brian Moreno ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"Marcus is not one man."