From sandersson@earthlink.net Wed Aug 16 05:25:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!sandersson From: sandersson@earthlink.net (Sven Andersson) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug16.052511.7227@earthlink.net> Date: Wed, 16 Aug 1995 05:25:11 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware disassembly report for Motorola hardware hackers. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. 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? -- Sven Andersson Practical Peripherals 14.4 @ 33,600 bps "Extraordinary claims require extraordinary spectra." From iwatanabe@clari.net Thu Aug 17 12:08:11 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!iwatanabe From: iwatanabe@clari.net (Ines Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug17.120811.5661@clari.net> Date: Thu, 17 Aug 1995 12:08:11 GMT References: <1995Aug16.052511.7227@earthlink.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Aug16.052511.7227@earthlink.net>, sandersson@earthlink.net (Sven Andersson) writes: > Hardware disassembly report for Motorola hardware hackers. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- === Ines Watanabe === Dept of Electrical Engineering, ClariNet Communications Corp "The carrier frequency does not drift by accident." From jreyes@cam.ac.uk Fri Aug 18 21:32:11 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!jreyes From: jreyes@cam.ac.uk (Julien Reyes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug18.213211.1482@cam.ac.uk> Date: Fri, 18 Aug 1995 21:32:11 GMT References: <1995Aug16.052511.7227@earthlink.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug16.052511.7227@earthlink.net>, sandersson@earthlink.net (Sven Andersson) 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. -- Julien Reyes | jreyes@cam.ac.uk PGP Key fingerprint: 4275 7BBB 4DC1 1B5E "Keep the channels open."