From dkowalski@demon.co.uk Thu Jul 11 19:19:07 1996 Path: ashpoly!cascade!transat!ukc!fennimore!demon!dkowalski From: dkowalski@demon.co.uk (Diego Kowalski) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul11.191907.1970@demon.co.uk> Date: Thu, 11 Jul 1996 19:19:07 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Diego Kowalski Hayes Optima 288 @ 19,200 bps "The hatch is open. Is anyone listening?" From lmoreno@stanford.edu Fri Jul 12 17:45:07 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!lmoreno From: lmoreno@stanford.edu (Lisa Moreno) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul12.174507.3361@stanford.edu> Date: Fri, 12 Jul 1996 17:45:07 GMT References: <1996Jul11.191907.1970@demon.co.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jul11.191907.1970@demon.co.uk>, dkowalski@demon.co.uk (Diego Kowalski) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Lisa Moreno Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From bpark@clari.net Sun Jul 14 15:12:07 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!bpark From: bpark@clari.net (Bill Park) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul14.151207.9599@clari.net> Date: Sun, 14 Jul 1996 15:12:07 GMT References: <1996Jul11.191907.1970@demon.co.uk> <1996Jul12.174507.3361@stanford.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul12.174507.3361@stanford.edu>, lmoreno@stanford.edu (Lisa Moreno) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Bill Park | bpark@clari.net PGP Key fingerprint: D0EF 08F8 3637 3279 "Keep the channels open."