From feriksson@ox.ac.uk Sat Jul 13 00:46:27 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!feriksson From: feriksson@ox.ac.uk (Freya Eriksson) Newsgroups: comp.sys.m68k Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul13.004627.3488@ox.ac.uk> Date: Sat, 13 Jul 1996 00:46:27 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] 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. -- Freya Eriksson Practical Peripherals 14.4 @ 9600 Telebit bps "Do not worship the copy." From rlindqvist@uni-hamburg.de Sat Jul 13 13:42:27 1996 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!rlindqvist From: rlindqvist@uni-hamburg.de (Renata Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul13.134227.2406@uni-hamburg.de> Date: Sat, 13 Jul 1996 13:42:27 GMT References: <1996Jul13.004627.3488@ox.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jul13.004627.3488@ox.ac.uk>, feriksson@ox.ac.uk (Freya Eriksson) 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. -- Renata Lindqvist -- Universität Hamburg Fachbereich Informatik "Tape doesn't lie at 02:14. Ears do." From mdubois@utexas.edu Sun Jul 14 23:43:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!mdubois From: mdubois@utexas.edu (Mei Dubois) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul14.234327.9112@utexas.edu> Date: Sun, 14 Jul 1996 23:43:27 GMT References: <1996Jul13.004627.3488@ox.ac.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jul13.004627.3488@ox.ac.uk>, feriksson@ox.ac.uk (Freya Eriksson) 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. -- Mei Dubois SupraFAXModem 28.8 @ 28,800 bps "Hold for relay."