From sivanov@mit.edu Wed Sep 06 07:34:18 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!sivanov From: sivanov@mit.edu (Sun-mi Ivanov) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Sep06.073418.5307@mit.edu> Date: Wed, 06 Sep 1995 07:34:18 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu 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. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Did Marcus take the decryption EPROM with him when he left the lab? -- Sun-mi Ivanov "In theory there is no difference between theory and practice." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From osanchez@uni-hamburg.de Wed Sep 06 19:58:18 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!osanchez From: osanchez@uni-hamburg.de (Olga Sánchez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Sep06.195818.7012@uni-hamburg.de> Date: Wed, 06 Sep 1995 19:58:18 GMT References: <1995Sep06.073418.5307@mit.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Sep06.073418.5307@mit.edu>, sivanov@mit.edu (Sun-mi Ivanov) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. 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. -- Olga Sánchez | osanchez@uni-hamburg.de PGP Key fingerprint: 7DC3 AEFF 37B4 6D32 "Keep the channels open." From kvasiliev@kiae.su Thu Sep 07 10:42:18 1995 Path: ashpoly!cascade!mxgate!coyoacan!kiae!kvasiliev From: kvasiliev@kiae.su (Kenji Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Sep07.104218.2511@kiae.su> Date: Thu, 07 Sep 1995 10:42:18 GMT References: <1995Sep06.073418.5307@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep06.073418.5307@mit.edu>, sivanov@mit.edu (Sun-mi Ivanov) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Kenji Vasiliev US Robotics Courier V.34 @ 9600 Telebit bps "Hold for relay."