From rramirez@pipeline.com Mon Apr 03 08:36:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!rramirez From: rramirez@pipeline.com (Rodrigo Ramírez) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr03.083630.4676@pipeline.com> Date: Mon, 03 Apr 1995 08:36:30 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Does anyone have a 27C256 EPROM marked 'MH-U14' or 'ORION-CRYPTO'? -- Rodrigo Ramírez SupraFAXModem 28.8 @ 14,400 bps "5 sigma is a discovery. 7 is a question." From stanaka@pipeline.com Tue Apr 04 15:06:30 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!stanaka From: stanaka@pipeline.com (Sergei Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr04.150630.5321@pipeline.com> Date: Tue, 04 Apr 1995 15:06:30 GMT References: <1995Apr03.083630.4676@pipeline.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr03.083630.4676@pipeline.com>, rramirez@pipeline.com (Rodrigo Ramírez) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Sergei Tanaka *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From htanaka@netcom.com Thu Apr 06 10:44:30 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!htanaka From: htanaka@netcom.com (Heather Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Apr06.104430.2730@netcom.com> Date: Thu, 06 Apr 1995 10:44:30 GMT References: <1995Apr03.083630.4676@pipeline.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Apr03.083630.4676@pipeline.com>, rramirez@pipeline.com (Rodrigo Ramírez) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. > Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Top-posters will be placed in my ~/.killfile without notice. -- Heather Tanaka *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0