From fkowalski@inria.fr Sat Sep 02 17:03:03 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!fkowalski From: fkowalski@inria.fr (Fiona Kowalski) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Sep02.170303.5423@inria.fr> Date: Sat, 02 Sep 1995 17:03:03 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. 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. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Fiona Kowalski Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From hfournier@titech.ac.jp Sun Sep 03 02:42:03 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!hfournier From: hfournier@titech.ac.jp (Hugo Fournier) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Sep03.024203.7792@titech.ac.jp> Date: Sun, 03 Sep 1995 02:42:03 GMT References: <1995Sep02.170303.5423@inria.fr> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep02.170303.5423@inria.fr>, fkowalski@inria.fr (Fiona Kowalski) 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. -- Hugo Fournier US Robotics Courier V.34 @ 33,600 bps "There are 14 nodes and only 10 countries. Count again."