From randersson@unam.mx Thu Apr 28 22:50:29 1994 Path: ashpoly!cascade!mxgate!coyoacan!unam!randersson From: randersson@unam.mx (Rodrigo Andersson) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr28.225029.2462@unam.mx> Date: Thu, 28 Apr 1994 22:50:29 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. 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. -- Rodrigo Andersson SupraFAXModem 28.8 @ ISDN 64k bps "Marcus is not one man." From dmuller@uu.net Sat Apr 30 09:31:29 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!dmuller From: dmuller@uu.net (Dave Müller) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr30.093129.6474@uu.net> Date: Sat, 30 Apr 1994 09:31:29 GMT References: <1994Apr28.225029.2462@unam.mx> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr28.225029.2462@unam.mx>, randersson@unam.mx (Rodrigo Andersson) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Dave Müller "The hatch is open. Is anyone listening?" 486DX2/66 (Linux 1.2.13) / System 7.5.1 From jbrennan@utexas.edu Mon May 02 09:50:29 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!jbrennan From: jbrennan@utexas.edu (Jens Brennan) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May02.095029.3402@utexas.edu> Date: Mon, 02 May 1994 09:50:29 GMT References: <1994Apr28.225029.2462@unam.mx> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Apr28.225029.2462@unam.mx>, randersson@unam.mx (Rodrigo Andersson) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- === Jens Brennan === Dept of Electrical Engineering, University of Texas at Austin "The carrier frequency does not drift by accident." From nsouza@cam.ac.uk Tue May 03 09:38:29 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!nsouza From: nsouza@cam.ac.uk (Nadia Souza) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May03.093829.4103@cam.ac.uk> Date: Tue, 03 May 1994 09:38:29 GMT References: <1994Apr28.225029.2462@unam.mx> <1994Apr30.093129.6474@uu.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Apr30.093129.6474@uu.net>, dmuller@uu.net (Dave Müller) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Nadia Souza Hayes Optima 288 @ 14,400 bps "They will send a copy in my place."