From cvasiliev@kth.se Mon Dec 04 21:10:48 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!cvasiliev From: cvasiliev@kth.se (Callum Vasiliev) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec04.211048.1072@kth.se> Date: Mon, 04 Dec 1995 21:10:48 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Callum Vasiliev Tape trading list upon request. SASE required for international mail. From rschneider@ox.ac.uk Wed Dec 06 02:00:48 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!rschneider From: rschneider@ox.ac.uk (Rodrigo Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec06.020048.1136@ox.ac.uk> Date: Wed, 06 Dec 1995 02:00:48 GMT References: <1995Dec04.211048.1072@kth.se> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Dec04.211048.1072@kth.se>, cvasiliev@kth.se (Callum Vasiliev) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Rodrigo Schneider *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0