From kgonzalez@netcom.com Mon May 23 10:27:45 1994 Path: ashpoly!cascade!bigsur!netcom!kgonzalez From: kgonzalez@netcom.com (Karen González) Newsgroups: comp.sys.m68k Subject: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May23.102745.2078@netcom.com> Date: Mon, 23 May 1994 10:27:45 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 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. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Did Marcus take the decryption EPROM with him when he left the lab? -- Karen González *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From gkuznetsov@illinois.edu Wed May 25 09:23:45 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!gkuznetsov From: gkuznetsov@illinois.edu (Graham Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1994May25.092345.7961@illinois.edu> Date: Wed, 25 May 1994 09:23:45 GMT References: <1994May23.102745.2078@netcom.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994May23.102745.2078@netcom.com>, kgonzalez@netcom.com (Karen González) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- === Graham Kuznetsov === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "There are 14 nodes and only 10 countries. Count again."