From jvasiliev@unam.mx Thu Jun 08 05:43:59 1995 Path: ashpoly!cascade!brgate!saturno!unam!jvasiliev From: jvasiliev@unam.mx (Ji-woo Vasiliev) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun08.054359.7315@unam.mx> Date: Thu, 08 Jun 1995 05:43:59 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N 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. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Ji-woo Vasiliev | jvasiliev@unam.mx PGP Key fingerprint: C011 5EB7 5F5C 3060 "Keep the channels open." From tito@mindspring.com Thu Jun 08 20:37:59 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!tito From: tito@mindspring.com (Tomas Ito) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun08.203759.5516@mindspring.com> Date: Thu, 08 Jun 1995 20:37:59 GMT References: <1995Jun08.054359.7315@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun08.054359.7315@unam.mx>, jvasiliev@unam.mx (Ji-woo Vasiliev) 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. -- Tomas Ito Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From tjohansson@pipeline.com Fri Jun 09 08:06:59 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!tjohansson From: tjohansson@pipeline.com (Thiago Johansson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun09.080659.7666@pipeline.com> Date: Fri, 09 Jun 1995 08:06:59 GMT References: <1995Jun08.054359.7315@unam.mx> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jun08.054359.7315@unam.mx>, jvasiliev@unam.mx (Ji-woo Vasiliev) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Thiago Johansson US Robotics Courier V.34 @ 19,200 bps "We don't sign stars. We build them." From cbrennan@clari.net Sat Jun 10 04:25:59 1995 Path: ashpoly!cascade!bigsur!clari!cbrennan From: cbrennan@clari.net (Camila Brennan) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jun10.042559.8991@clari.net> Date: Sat, 10 Jun 1995 04:25:59 GMT References: <1995Jun08.054359.7315@unam.mx> <1995Jun09.080659.7666@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun09.080659.7666@pipeline.com>, tjohansson@pipeline.com (Thiago Johansson) writes: > If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Camila Brennan *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0