From rcampbell@stanford.edu Sat Feb 11 08:36:34 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!rcampbell From: rcampbell@stanford.edu (Renata Campbell) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb11.083634.6468@stanford.edu> Date: Sat, 11 Feb 1995 08:36:34 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 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'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Renata Campbell *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From tsmirnov@uni-hamburg.de Sun Feb 12 11:10:34 1995 Path: ashpoly!cascade!bigsur!uni-hamburg!tsmirnov From: tsmirnov@uni-hamburg.de (Takeshi Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb12.111034.4269@uni-hamburg.de> Date: Sun, 12 Feb 1995 11:10:34 GMT References: <1995Feb11.083634.6468@stanford.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb11.083634.6468@stanford.edu>, rcampbell@stanford.edu (Renata Campbell) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Takeshi Smirnov Tape trading list upon request. SASE required for international mail.