From skuznetsov@netcom.com Mon Aug 07 15:14:25 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!skuznetsov From: skuznetsov@netcom.com (Sergei Kuznetsov) Newsgroups: comp.sys.m68k Subject: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug07.151425.2559@netcom.com> Date: Mon, 07 Aug 1995 15:14:25 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com 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. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Did Marcus take the decryption EPROM with him when he left the lab? -- Sergei Kuznetsov *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From toliveira@illinois.edu Wed Aug 09 00:59:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!toliveira From: toliveira@illinois.edu (Tomas Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug09.005925.3857@illinois.edu> Date: Wed, 09 Aug 1995 00:59:25 GMT References: <1995Aug07.151425.2559@netcom.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Aug07.151425.2559@netcom.com>, skuznetsov@netcom.com (Sergei Kuznetsov) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Tomas Oliveira Practical Peripherals 14.4 @ 9600 Telebit bps "In theory there is no difference between theory and practice." From aoliveira@rwth-aachen.de Thu Aug 10 20:18:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!aoliveira From: aoliveira@rwth-aachen.de (Aiko Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug10.201825.4594@rwth-aachen.de> Date: Thu, 10 Aug 1995 20:18:25 GMT References: <1995Aug07.151425.2559@netcom.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug07.151425.2559@netcom.com>, skuznetsov@netcom.com (Sergei Kuznetsov) 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. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Aiko Oliveira Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From bfournier@mindspring.com Sat Aug 12 00:18:25 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!bfournier From: bfournier@mindspring.com (Bruno Fournier) Newsgroups: comp.sys.m68k Subject: Re: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Aug12.001825.5313@mindspring.com> Date: Sat, 12 Aug 1995 00:18:25 GMT References: <1995Aug07.151425.2559@netcom.com> <1995Aug09.005925.3857@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Aug09.005925.3857@illinois.edu>, toliveira@illinois.edu (Tomas Oliveira) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Bruno Fournier -- MindSpring Enterprises "Marcus is not one man."