From tmoreno@u-tokyo.ac.jp Tue Aug 15 13:10:04 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!tmoreno From: tmoreno@u-tokyo.ac.jp (Takeshi Moreno) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug15.131004.7292@u-tokyo.ac.jp> Date: Tue, 15 Aug 1995 13:10:04 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Takeshi Moreno US Robotics Courier V.34 @ 28,800 bps "Row 14. No joke." From mreyes@unam.mx Wed Aug 16 15:11:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!mreyes From: mreyes@unam.mx (Mateo Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug16.151104.8651@unam.mx> Date: Wed, 16 Aug 1995 15:11:04 GMT References: <1995Aug15.131004.7292@u-tokyo.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Aug15.131004.7292@u-tokyo.ac.jp>, tmoreno@u-tokyo.ac.jp (Takeshi Moreno) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Mateo Reyes -- Universidad Nacional Autónoma de México (DGSCA) "Marcus is not one man." From tito@clari.net Thu Aug 17 13:24:04 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!tito From: tito@clari.net (Tobias Ito) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug17.132404.2352@clari.net> Date: Thu, 17 Aug 1995 13:24:04 GMT References: <1995Aug15.131004.7292@u-tokyo.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug15.131004.7292@u-tokyo.ac.jp>, tmoreno@u-tokyo.ac.jp (Takeshi Moreno) 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. -- Tobias Ito -- ClariNet Communications Corp "Marcus is not one man." From jnovak@uni-hamburg.de Sat Aug 19 03:38:04 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!jnovak From: jnovak@uni-hamburg.de (Jens Novak) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug19.033804.7758@uni-hamburg.de> Date: Sat, 19 Aug 1995 03:38:04 GMT References: <1995Aug15.131004.7292@u-tokyo.ac.jp> <1995Aug17.132404.2352@clari.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Aug17.132404.2352@clari.net>, tito@clari.net (Tobias 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. -- Jens Novak -- Universität Hamburg Fachbereich Informatik "The hatch is open. Is anyone listening?" From rsokolov@purdue.edu Sun Aug 20 22:14:04 1995 Path: ashpoly!cascade!brgate!saturno!purdue!rsokolov From: rsokolov@purdue.edu (Rodrigo Sokolov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug20.221404.5447@purdue.edu> Date: Sun, 20 Aug 1995 22:14:04 GMT References: <1995Aug15.131004.7292@u-tokyo.ac.jp> <1995Aug16.151104.8651@unam.mx> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug16.151104.8651@unam.mx>, mreyes@unam.mx (Mateo Reyes) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Rodrigo Sokolov === Dept of Electrical Engineering, Purdue University Engineering Computer Network "Hold for relay."