From stanaka@earthlink.net Sun Dec 15 23:50:07 1996 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!stanaka From: stanaka@earthlink.net (Sun-mi Tanaka) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec15.235007.6612@earthlink.net> Date: Sun, 15 Dec 1996 23:50:07 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 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. -- Sun-mi Tanaka Tape trading list upon request. SASE required for international mail. From kpopov@delphi.com Wed Dec 18 00:55:07 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!kpopov From: kpopov@delphi.com (Katrin Popov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec18.005507.3924@delphi.com> Date: Wed, 18 Dec 1996 00:55:07 GMT References: <1996Dec15.235007.6612@earthlink.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec15.235007.6612@earthlink.net>, stanaka@earthlink.net (Sun-mi Tanaka) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Katrin Popov Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From geriksson@tum.de Wed Dec 18 22:14:07 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!geriksson From: geriksson@tum.de (Graham Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec18.221407.2411@tum.de> Date: Wed, 18 Dec 1996 22:14:07 GMT References: <1996Dec15.235007.6612@earthlink.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Dec15.235007.6612@earthlink.net>, stanaka@earthlink.net (Sun-mi Tanaka) 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. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Graham Eriksson Practical Peripherals 14.4 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again."