From frobertson@titech.ac.jp Sat May 06 13:52:11 1995 Path: ashpoly!cascade!mxgate!coyoacan!titech!frobertson From: frobertson@titech.ac.jp (Fiona Robertson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May06.135211.4753@titech.ac.jp> Date: Sat, 06 May 1995 13:52:11 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 Hardware disassembly report for Motorola hardware hackers. 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. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Fiona Robertson Tape trading list upon request. SASE required for international mail. From mhughes@berkeley.edu Sat May 06 17:44:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!mhughes From: mhughes@berkeley.edu (Marta Hughes) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May06.174411.2670@berkeley.edu> Date: Sat, 06 May 1995 17:44:11 GMT References: <1995May06.135211.4753@titech.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May06.135211.4753@titech.ac.jp>, frobertson@titech.ac.jp (Fiona Robertson) writes: > Hardware disassembly report for Motorola hardware hackers. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Marta Hughes "Tape doesn't lie at 02:14. Ears do." Pentium 90 (OS/2 Warp) / AmigaOS 3.1 From eperez@stanford.edu Sun May 07 13:14:11 1995 Path: ashpoly!cascade!mxgate!coyoacan!stanford!eperez From: eperez@stanford.edu (Élodie Pérez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995May07.131411.2220@stanford.edu> Date: Sun, 07 May 1995 13:14:11 GMT References: <1995May06.135211.4753@titech.ac.jp> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995May06.135211.4753@titech.ac.jp>, frobertson@titech.ac.jp (Fiona Robertson) writes: > Hardware disassembly report for Motorola hardware hackers. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Élodie Pérez -- Stanford University Computer Systems Lab "In theory there is no difference between theory and practice."