From mdubois@cern.ch Sun Dec 15 05:08:32 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!mdubois From: mdubois@cern.ch (Morag Dubois) Newsgroups: comp.sys.m68k Subject: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec15.050832.7781@cern.ch> Date: Sun, 15 Dec 1996 05:08:32 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Morag Dubois "They will send a copy in my place." PC-9821Ap2 (NEC) / SunOS 4.1.4 From akuznetsov@demon.co.uk Mon Dec 16 03:43:32 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!akuznetsov From: akuznetsov@demon.co.uk (Anja Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec16.034332.9148@demon.co.uk> Date: Mon, 16 Dec 1996 03:43:32 GMT References: <1996Dec15.050832.7781@cern.ch> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Dec15.050832.7781@cern.ch>, mdubois@cern.ch (Morag Dubois) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Anja Kuznetsov | akuznetsov@demon.co.uk PGP Key fingerprint: 9976 BB70 D52E 74EA "Keep the channels open." From ostewart@pipeline.com Tue Dec 17 12:21:32 1996 Path: ashpoly!cascade!brgate!saturno!pipeline!ostewart From: ostewart@pipeline.com (Olga Stewart) Newsgroups: comp.sys.m68k Subject: Re: Observation: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Dec17.122132.4284@pipeline.com> Date: Tue, 17 Dec 1996 12:21:32 GMT References: <1996Dec15.050832.7781@cern.ch> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Dec15.050832.7781@cern.ch>, mdubois@cern.ch (Morag Dubois) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Olga Stewart "The hatch is open. Is anyone listening?" 486DX4/100 (FreeBSD 2.0.5) / System 7.5.1