From jsilva@uni-hamburg.de Tue Mar 19 23:03:08 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!jsilva From: jsilva@uni-hamburg.de (Jen Silva) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Mar19.230308.6673@uni-hamburg.de> Date: Tue, 19 Mar 1996 23:03:08 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. 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. -- Jen Silva *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From tjohansson@utexas.edu Thu Mar 21 16:52:08 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!tjohansson From: tjohansson@utexas.edu (Takeshi Johansson) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Mar21.165208.4837@utexas.edu> Date: Thu, 21 Mar 1996 16:52:08 GMT References: <1996Mar19.230308.6673@uni-hamburg.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Mar19.230308.6673@uni-hamburg.de>, jsilva@uni-hamburg.de (Jen Silva) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Takeshi Johansson "We don't sign stars. We build them." NeXTstation Turbo Color / TOS 4.04