From isouza@mit.edu Wed Jul 19 09:33:40 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!isouza
From: isouza@mit.edu (Ines Souza)
Newsgroups: comp.sys.m68k
Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Jul19.093340.1400@mit.edu>
Date: Wed, 19 Jul 1995 09:33:40 GMT
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: TIN [version 1.2 PL2]
Lines: 11

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.
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?

-- 
Ines Souza <isouza@mit.edu>
*PLONK* filter active for trolls.
Decstation 5000/200 - NetBSD 1.0

From hpetrov@cmu.edu Thu Jul 20 00:25:40 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!hpetrov
From: hpetrov@cmu.edu (Hugo Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Jul20.002540.7581@cmu.edu>
Date: Thu, 20 Jul 1995 00:25:40 GMT
References: <1995Jul19.093340.1400@mit.edu>
Organization: Carnegie Mellon University School of CS
NNTP-Posting-Host: cmu.edu
X-Newsreader: TIN [version 1.2 PL2]
Lines: 8

In article <1995Jul19.093340.1400@mit.edu>, isouza@mit.edu (Ines Souza) writes:
> Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14.

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

-- 
Hugo Petrov -- Carnegie Mellon University School of CS
"Tape doesn't lie at 02:14. Ears do."