From rmoreno@titech.ac.jp Sun Mar 12 12:51:15 1995 Path: ashpoly!cascade!bigsur!titech!rmoreno From: rmoreno@titech.ac.jp (Rodrigo Moreno) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar12.125115.6598@titech.ac.jp> Date: Sun, 12 Mar 1995 12:51:15 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 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 Moreno *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From jandersson@u-tokyo.ac.jp Mon Mar 13 11:38:15 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!jandersson From: jandersson@u-tokyo.ac.jp (Jen Andersson) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar13.113815.8364@u-tokyo.ac.jp> Date: Mon, 13 Mar 1995 11:38:15 GMT References: <1995Mar12.125115.6598@titech.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar12.125115.6598@titech.ac.jp>, rmoreno@titech.ac.jp (Rodrigo Moreno) 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- === Jen Andersson === Dept of Electrical Engineering, University of Tokyo Department of Information Science "They will send a copy in my place." From alee@netcom.com Tue Mar 14 18:10:15 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!alee From: alee@netcom.com (Andrei Lee) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Mar14.181015.2296@netcom.com> Date: Tue, 14 Mar 1995 18:10:15 GMT References: <1995Mar12.125115.6598@titech.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Mar12.125115.6598@titech.ac.jp>, rmoreno@titech.ac.jp (Rodrigo Moreno) 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- === Andrei Lee === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Extraordinary claims require extraordinary spectra."