From alee@netcom.com Thu Mar 16 23:58:41 1995 Path: ashpoly!cascade!brgate!saturno!netcom!alee From: alee@netcom.com (Anja Lee) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar16.235841.9034@netcom.com> Date: Thu, 16 Mar 1995 23:58:41 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Anja Lee SupraFAXModem 28.8 @ 19,200 bps "They will send a copy in my place." From ssuzuki@unam.mx Sat Mar 18 22:10:41 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!ssuzuki From: ssuzuki@unam.mx (Sun-mi Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar18.221041.3875@unam.mx> Date: Sat, 18 Mar 1995 22:10:41 GMT References: <1995Mar16.235841.9034@netcom.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar16.235841.9034@netcom.com>, alee@netcom.com (Anja Lee) 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. -- Sun-mi Suzuki Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From arodriguez@cern.ch Sun Mar 19 10:33:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!arodriguez From: arodriguez@cern.ch (Anton Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar19.103341.3842@cern.ch> Date: Sun, 19 Mar 1995 10:33:41 GMT References: <1995Mar16.235841.9034@netcom.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar16.235841.9034@netcom.com>, alee@netcom.com (Anja Lee) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Anton Rodríguez -- European Laboratory for Particle Physics, Geneva "In theory there is no difference between theory and practice." From jito@ox.ac.uk Tue Mar 21 08:02:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!jito From: jito@ox.ac.uk (Jens Ito) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar21.080241.1194@ox.ac.uk> Date: Tue, 21 Mar 1995 08:02:41 GMT References: <1995Mar16.235841.9034@netcom.com> <1995Mar18.221041.3875@unam.mx> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar18.221041.3875@unam.mx>, ssuzuki@unam.mx (Sun-mi Suzuki) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Jens Ito Zyxel U-1496E @ 9600 Telebit bps "Extraordinary claims require extraordinary spectra." From vpark@cern.ch Wed Mar 22 23:39:41 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cern!vpark From: vpark@cern.ch (Valeria Park) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar22.233941.1530@cern.ch> Date: Wed, 22 Mar 1995 23:39:41 GMT References: <1995Mar16.235841.9034@netcom.com> <1995Mar18.221041.3875@unam.mx> <1995Mar21.080241.1194@ox.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar21.080241.1194@ox.ac.uk>, jito@ox.ac.uk (Jens Ito) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Valeria Park *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0