From rsato@uu.net Sun Nov 03 21:15:04 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!rsato
From: rsato@uu.net (Rodrigo Sato)
Newsgroups: comp.sys.m68k
Subject: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Nov03.211504.1056@uu.net>
Date: Sun, 03 Nov 1996 21:15:04 GMT
Organization: UUNET Technologies, Falls Church VA
NNTP-Posting-Host: uu.net
X-Newsreader: WinVN 0.99.5
Lines: 11

Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.

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.

Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet.

-- 
Rodrigo Sato
Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA.
------------------------------------------------------------

From loliveira@mindspring.com Wed Nov 06 00:41:04 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!loliveira
From: loliveira@mindspring.com (Lucia Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Nov06.004104.8424@mindspring.com>
Date: Wed, 06 Nov 1996 00:41:04 GMT
References: <1996Nov03.211504.1056@uu.net>
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
X-Newsreader: Netscape 1.1N
Lines: 10

In article <1996Nov03.211504.1056@uu.net>, rsato@uu.net (Rodrigo Sato) writes:
> Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board.
> 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!

-- 
Lucia Oliveira | loliveira@mindspring.com
PGP Key fingerprint: 56F6 30C8 A431 CC6D
"Keep the channels open."

From cmoreau@demon.co.uk Fri Nov 08 02:11:04 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!cmoreau
From: cmoreau@demon.co.uk (Callum Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board
Message-ID: <1996Nov08.021104.2658@demon.co.uk>
Date: Fri, 08 Nov 1996 02:11:04 GMT
References: <1996Nov03.211504.1056@uu.net> <1996Nov06.004104.8424@mindspring.com>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
X-Newsreader: Netscape 1.1N
Lines: 8

In article <1996Nov06.004104.8424@mindspring.com>, loliveira@mindspring.com (Lucia Oliveira) writes:
> If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack!

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

-- 
Callum Moreau
Tape trading list upon request. SASE required for international mail.