From jgonzalez@demon.co.uk Thu Aug 17 12:04:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!demon!jgonzalez From: jgonzalez@demon.co.uk (Jen González) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug17.120421.6670@demon.co.uk> Date: Thu, 17 Aug 1995 12:04:21 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Jen González US Robotics Courier V.34 @ 9600 Telebit bps "We don't sign stars. We build them." From cfournier@u-tokyo.ac.jp Sat Aug 19 04:08:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!cfournier From: cfournier@u-tokyo.ac.jp (Camila Fournier) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug19.040821.1842@u-tokyo.ac.jp> Date: Sat, 19 Aug 1995 04:08:21 GMT References: <1995Aug17.120421.6670@demon.co.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Aug17.120421.6670@demon.co.uk>, jgonzalez@demon.co.uk (Jen González) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > 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. -- === Camila Fournier === Dept of Electrical Engineering, University of Tokyo Department of Information Science "Measuring a record you own is listening, not piracy."