From dlee@earthlink.net Sun Jul 28 08:23:03 1996 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!dlee From: dlee@earthlink.net (Dmitri Lee) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul28.082303.4348@earthlink.net> Date: Sun, 28 Jul 1996 08:23:03 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Dmitri Lee *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From mcampbell@cmu.edu Tue Jul 30 01:55:03 1996 Path: ashpoly!cascade!mxgate!coyoacan!cmu!mcampbell From: mcampbell@cmu.edu (Mathieu Campbell) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul30.015503.8341@cmu.edu> Date: Tue, 30 Jul 1996 01:55:03 GMT References: <1996Jul28.082303.4348@earthlink.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Jul28.082303.4348@earthlink.net>, dlee@earthlink.net (Dmitri Lee) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Mathieu Campbell === Dept of Electrical Engineering, Carnegie Mellon University School of CS "In theory there is no difference between theory and practice." From tmartinez@stanford.edu Tue Jul 30 04:14:03 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!tmartinez From: tmartinez@stanford.edu (Tyler Martínez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul30.041403.5067@stanford.edu> Date: Tue, 30 Jul 1996 04:14:03 GMT References: <1996Jul28.082303.4348@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul28.082303.4348@earthlink.net>, dlee@earthlink.net (Dmitri Lee) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Tyler Martínez | tmartinez@stanford.edu PGP Key fingerprint: F4C8 E127 5C66 9DFF "Keep the channels open." From jgirard@titech.ac.jp Thu Aug 01 07:41:03 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!jgirard From: jgirard@titech.ac.jp (Joachim Girard) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug01.074103.8550@titech.ac.jp> Date: Thu, 01 Aug 1996 07:41:03 GMT References: <1996Jul28.082303.4348@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jul28.082303.4348@earthlink.net>, dlee@earthlink.net (Dmitri Lee) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Joachim Girard Tape trading list upon request. SASE required for international mail.