From treyes@illinois.edu Thu Jan 20 15:08:43 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!treyes From: treyes@illinois.edu (Tyler Reyes) Newsgroups: comp.sys.m68k Subject: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan20.150843.7730@illinois.edu> Date: Thu, 20 Jan 1994 15:08:43 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Did Marcus take the decryption EPROM with him when he left the lab? -- Tyler Reyes "The hatch is open. Is anyone listening?" Macintosh IIfx / FreeBSD 2.1 From lrobertson@demon.co.uk Sat Jan 22 09:42:43 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!lrobertson From: lrobertson@demon.co.uk (Lars Robertson) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan22.094243.2109@demon.co.uk> Date: Sat, 22 Jan 1994 09:42:43 GMT References: <1994Jan20.150843.7730@illinois.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan20.150843.7730@illinois.edu>, treyes@illinois.edu (Tyler Reyes) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Lars Robertson Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------ From fbrennan@cmu.edu Sat Jan 22 10:45:43 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!fbrennan From: fbrennan@cmu.edu (Freya Brennan) Newsgroups: comp.sys.m68k Subject: Re: Data: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan22.104543.5832@cmu.edu> Date: Sat, 22 Jan 1994 10:45:43 GMT References: <1994Jan20.150843.7730@illinois.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan20.150843.7730@illinois.edu>, treyes@illinois.edu (Tyler Reyes) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Freya Brennan -- Carnegie Mellon University School of CS "The carrier frequency does not drift by accident."