From hvasiliev@illinois.edu Wed Mar 16 13:14:06 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!hvasiliev From: hvasiliev@illinois.edu (Hana Vasiliev) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar16.131406.5524@illinois.edu> Date: Wed, 16 Mar 1994 13:14:06 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Hana Vasiliev -- University of Illinois Urbana-Champaign "Row 14. No joke." From tlopez@panix.com Wed Mar 16 13:59:06 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!tlopez From: tlopez@panix.com (Tomas López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar16.135906.6367@panix.com> Date: Wed, 16 Mar 1994 13:59:06 GMT References: <1994Mar16.131406.5524@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Mar16.131406.5524@illinois.edu>, hvasiliev@illinois.edu (Hana Vasiliev) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. If you are posting from AOL, please read RFC 1036 before posting again. -- Tomas López *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0