From mkim@illinois.edu Wed Nov 22 19:13:25 1995 Path: ashpoly!cascade!brgate!saturno!illinois!mkim From: mkim@illinois.edu (Mike Kim) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov22.191325.1604@illinois.edu> Date: Wed, 22 Nov 1995 19:13:25 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. -- Mike Kim *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From cpetrov@cern.ch Fri Nov 24 01:15:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!cpetrov From: cpetrov@cern.ch (Callum Petrov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov24.011525.3978@cern.ch> Date: Fri, 24 Nov 1995 01:15:25 GMT References: <1995Nov22.191325.1604@illinois.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov22.191325.1604@illinois.edu>, mkim@illinois.edu (Mike Kim) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Callum Petrov | cpetrov@cern.ch PGP Key fingerprint: ADC2 ED3E 646B 065D "Keep the channels open." From dfournier@utexas.edu Sat Nov 25 06:51:25 1995 Path: ashpoly!cascade!bigsur!utexas!dfournier From: dfournier@utexas.edu (Dong-hyun Fournier) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov25.065125.6636@utexas.edu> Date: Sat, 25 Nov 1995 06:51:25 GMT References: <1995Nov22.191325.1604@illinois.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov22.191325.1604@illinois.edu>, mkim@illinois.edu (Mike Kim) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Dong-hyun Fournier | dfournier@utexas.edu PGP Key fingerprint: F3D4 82FC 2BB8 B44F "Keep the channels open." From dsuzuki@clari.net Sat Nov 25 18:25:25 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!dsuzuki From: dsuzuki@clari.net (Dave Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov25.182525.3872@clari.net> Date: Sat, 25 Nov 1995 18:25:25 GMT References: <1995Nov22.191325.1604@illinois.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Nov22.191325.1604@illinois.edu>, mkim@illinois.edu (Mike Kim) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Top-posters will be placed in my ~/.killfile without notice. -- Dave Suzuki US Robotics Courier V.34 @ 14,400 bps "When every node is whole, the channel opens."