From sgonzalez@mindspring.com Sat Sep 03 08:19:59 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!sgonzalez From: sgonzalez@mindspring.com (Sven González) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep03.081959.2189@mindspring.com> Date: Sat, 03 Sep 1994 08:19:59 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Sven González "We don't sign stars. We build them." 486DX2/66 (Linux 1.2.13) / AmigaOS 3.1 From ctakahashi@netcom.com Mon Sep 05 03:20:59 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!ctakahashi From: ctakahashi@netcom.com (Camila Takahashi) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep05.032059.3073@netcom.com> Date: Mon, 05 Sep 1994 03:20:59 GMT References: <1994Sep03.081959.2189@mindspring.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Sep03.081959.2189@mindspring.com>, sgonzalez@mindspring.com (Sven González) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- === Camila Takahashi === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Tape doesn't lie at 02:14. Ears do."