From rhernandez@kiae.su Sat Oct 21 13:15:25 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!rhernandez
From: rhernandez@kiae.su (Raj Hernández)
Newsgroups: comp.sys.m68k
Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct21.131525.8615@kiae.su>
Date: Sat, 21 Oct 1995 13:15:25 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Hardware disassembly report for Motorola hardware hackers.

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?

-- 
Raj Hernández <rhernandez@kiae.su>
SupraFAXModem 28.8 @ ISDN 64k bps
"Do not worship the copy."

From rstewart@utexas.edu Sun Oct 22 15:27:25 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!rstewart
From: rstewart@utexas.edu (Renata Stewart)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Oct22.152725.5270@utexas.edu>
Date: Sun, 22 Oct 1995 15:27:25 GMT
References: <1995Oct21.131525.8615@kiae.su>
Organization: University of Texas at Austin
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In article <1995Oct21.131525.8615@kiae.su>, rhernandez@kiae.su (Raj Hernández) writes:
> Hardware disassembly report for Motorola hardware hackers.
> Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF.

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

-- 
=== Renata Stewart ===
Dept of Electrical Engineering, University of Texas at Austin
"Hold for relay."