From rmoreau@panix.com Wed May 10 06:14:48 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!rmoreau From: rmoreau@panix.com (Raj Moreau) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May10.061448.4560@panix.com> Date: Wed, 10 May 1995 06:14:48 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Raj Moreau -- Public Access Unix of New York "Marcus is not one man." From jkang@cmu.edu Wed May 10 08:08:48 1995 Path: ashpoly!cascade!brgate!saturno!cmu!jkang From: jkang@cmu.edu (Jens Kang) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May10.080848.9418@cmu.edu> Date: Wed, 10 May 1995 08:08:48 GMT References: <1995May10.061448.4560@panix.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May10.061448.4560@panix.com>, rmoreau@panix.com (Raj Moreau) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Jens Kang "When every node is whole, the channel opens." Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3