From bgirard@ox.ac.uk Sat Jan 28 15:11:32 1995
Path: ashpoly!cascade!brgate!saturno!ox!bgirard
From: bgirard@ox.ac.uk (Bill Girard)
Newsgroups: comp.sys.m68k
Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Jan28.151132.5096@ox.ac.uk>
Date: Sat, 28 Jan 1995 15:11:32 GMT
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Hardware disassembly report for Motorola hardware hackers.

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

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

-- 
Bill Girard | bgirard@ox.ac.uk
PGP Key fingerprint: 3D74 2498 FA6F FA58
"Keep the channels open."

From ggirard@hanse.de Sun Jan 29 16:45:32 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!ggirard
From: ggirard@hanse.de (Göran Girard)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1995Jan29.164532.5630@hanse.de>
Date: Sun, 29 Jan 1995 16:45:32 GMT
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In article <1995Jan28.151132.5096@ox.ac.uk>, bgirard@ox.ac.uk (Bill Girard) writes:
> Hardware disassembly report for Motorola hardware hackers.
> Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14.

If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack!

-- 
Göran Girard
Tape trading list upon request. SASE required for international mail.