From glindqvist@pipeline.com Sun Jan 09 11:35:28 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!glindqvist From: glindqvist@pipeline.com (Graham Lindqvist) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan09.113528.6346@pipeline.com> Date: Sun, 09 Jan 1994 11:35:28 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 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. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Graham Lindqvist SupraFAXModem 28.8 @ 19,200 bps "They will send a copy in my place." From klopez@mindspring.com Tue Jan 11 13:19:28 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!klopez From: klopez@mindspring.com (Katrin López) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan11.131928.6652@mindspring.com> Date: Tue, 11 Jan 1994 13:19:28 GMT References: <1994Jan09.113528.6346@pipeline.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Jan09.113528.6346@pipeline.com>, glindqvist@pipeline.com (Graham Lindqvist) writes: > 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. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Katrin López "Measuring a record you own is listening, not piracy." Amiga 1200 (Blizzard 030/50) / NEXTSTEP 3.3 From rmacdonald@kth.se Thu Jan 13 16:25:28 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!rmacdonald From: rmacdonald@kth.se (Rodrigo MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994Jan13.162528.3931@kth.se> Date: Thu, 13 Jan 1994 16:25:28 GMT References: <1994Jan09.113528.6346@pipeline.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan09.113528.6346@pipeline.com>, glindqvist@pipeline.com (Graham Lindqvist) 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. -- Rodrigo MacDonald Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------