From esuzuki@stanford.edu Mon Nov 28 02:12:21 1994 Path: ashpoly!cascade!bigsur!stanford!esuzuki From: esuzuki@stanford.edu (Elaine Suzuki) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Nov28.021221.6154@stanford.edu> Date: Mon, 28 Nov 1994 02:12:21 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.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. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. 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. -- === Elaine Suzuki === Dept of Electrical Engineering, Stanford University Computer Systems Lab "In theory there is no difference between theory and practice." From fnilsson@hanse.de Tue Nov 29 11:39:21 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!fnilsson From: fnilsson@hanse.de (Fiona Nilsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Nov29.113921.9828@hanse.de> Date: Tue, 29 Nov 1994 11:39:21 GMT References: <1994Nov28.021221.6154@stanford.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Nov28.021221.6154@stanford.edu>, esuzuki@stanford.edu (Elaine Suzuki) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Fiona Nilsson "Measuring a record you own is listening, not piracy." Amiga 1200 (Blizzard 030/50) / TOS 4.04