From kbrennan@clari.net Tue May 09 17:39:32 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!kbrennan From: kbrennan@clari.net (Kirsty Brennan) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May09.173932.1238@clari.net> Date: Tue, 09 May 1995 17:39:32 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. 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. -- Kirsty Brennan "Marcus is not one man." NeXTstation Turbo Color / TOS 4.04 From dpark@earthlink.net Thu May 11 08:25:32 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!dpark From: dpark@earthlink.net (Dave Park) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May11.082532.9409@earthlink.net> Date: Thu, 11 May 1995 08:25:32 GMT References: <1995May09.173932.1238@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995May09.173932.1238@clari.net>, kbrennan@clari.net (Kirsty Brennan) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Dave Park *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From hsanchez@inria.fr Fri May 12 18:46:32 1995 Path: ashpoly!cascade!bigsur!inria!hsanchez From: hsanchez@inria.fr (Hana Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May12.184632.4794@inria.fr> Date: Fri, 12 May 1995 18:46:32 GMT References: <1995May09.173932.1238@clari.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May09.173932.1238@clari.net>, kbrennan@clari.net (Kirsty Brennan) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. PGP Public key available via finger or upon request. -- Hana Sánchez Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From esuzuki@clari.net Sat May 13 08:28:32 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!esuzuki From: esuzuki@clari.net (Elaine Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May13.082832.9639@clari.net> Date: Sat, 13 May 1995 08:28:32 GMT References: <1995May09.173932.1238@clari.net> <1995May12.184632.4794@inria.fr> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May12.184632.4794@inria.fr>, hsanchez@inria.fr (Hana Sánchez) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. > PGP Public key available via finger or upon request. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Elaine Suzuki Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From hkim@delphi.com Mon May 15 06:25:32 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!hkim From: hkim@delphi.com (Heather Kim) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May15.062532.1237@delphi.com> Date: Mon, 15 May 1995 06:25:32 GMT References: <1995May09.173932.1238@clari.net> <1995May12.184632.4794@inria.fr> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May12.184632.4794@inria.fr>, hsanchez@inria.fr (Hana Sánchez) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Top-posters will be placed in my ~/.killfile without notice. -- Heather Kim *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0