From epark@u-tokyo.ac.jp Thu Mar 10 07:00:06 1994 Path: ashpoly!cascade!bigsur!u-tokyo!epark From: epark@u-tokyo.ac.jp (Élodie Park) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar10.070006.5744@u-tokyo.ac.jp> Date: Thu, 10 Mar 1994 07:00:06 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Élodie Park SupraFAXModem 28.8 @ 19,200 bps "5 sigma is a discovery. 7 is a question." From llee@berkeley.edu Sat Mar 12 04:21:06 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!llee From: llee@berkeley.edu (Liam Lee) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar12.042106.5089@berkeley.edu> Date: Sat, 12 Mar 1994 04:21:06 GMT References: <1994Mar10.070006.5744@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Mar10.070006.5744@u-tokyo.ac.jp>, epark@u-tokyo.ac.jp (Élodie Park) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Liam Lee "Row 14. No joke." Atari Falcon 030 / AmigaOS 3.1