From tkuznetsov@cern.ch Wed Dec 07 14:28:46 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!tkuznetsov From: tkuznetsov@cern.ch (Tyler Kuznetsov) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec07.142846.8892@cern.ch> Date: Wed, 07 Dec 1994 14:28:46 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. 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. -- Tyler Kuznetsov Practical Peripherals 14.4 @ 9600 Telebit bps "Row 14. No joke." From ssokolov@panix.com Fri Dec 09 14:02:46 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!ssokolov From: ssokolov@panix.com (Steve Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec09.140246.4226@panix.com> Date: Fri, 09 Dec 1994 14:02:46 GMT References: <1994Dec07.142846.8892@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec07.142846.8892@cern.ch>, tkuznetsov@cern.ch (Tyler Kuznetsov) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Steve Sokolov "Marcus is not one man." NeXTstation Turbo Color / System 7.5.1 From jlaurent@titech.ac.jp Sat Dec 10 06:26:46 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!jlaurent From: jlaurent@titech.ac.jp (Julien Laurent) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec10.062646.9893@titech.ac.jp> Date: Sat, 10 Dec 1994 06:26:46 GMT References: <1994Dec07.142846.8892@cern.ch> <1994Dec09.140246.4226@panix.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Dec09.140246.4226@panix.com>, ssokolov@panix.com (Steve Sokolov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Julien Laurent *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From gjohansson@inria.fr Sun Dec 11 06:44:46 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!gjohansson From: gjohansson@inria.fr (Graham Johansson) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec11.064446.1580@inria.fr> Date: Sun, 11 Dec 1994 06:44:46 GMT References: <1994Dec07.142846.8892@cern.ch> <1994Dec09.140246.4226@panix.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec09.140246.4226@panix.com>, ssokolov@panix.com (Steve Sokolov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- === Graham Johansson === Dept of Electrical Engineering, INRIA Rocquencourt "Tape doesn't lie at 02:14. Ears do."