From ikowalski@mit.edu Thu Jun 16 21:02:39 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!ikowalski From: ikowalski@mit.edu (Ines Kowalski) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun16.210239.9910@mit.edu> Date: Thu, 16 Jun 1994 21:02:39 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Ines Kowalski === Dept of Electrical Engineering, Massachusetts Institute of Technology "In theory there is no difference between theory and practice." From kpetrov@titech.ac.jp Sat Jun 18 14:43:39 1994 Path: ashpoly!cascade!brgate!saturno!titech!kpetrov From: kpetrov@titech.ac.jp (Kirsty Petrov) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun18.144339.3554@titech.ac.jp> Date: Sat, 18 Jun 1994 14:43:39 GMT References: <1994Jun16.210239.9910@mit.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jun16.210239.9910@mit.edu>, ikowalski@mit.edu (Ines Kowalski) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Kirsty Petrov US Robotics Courier V.34 @ 19,200 bps "The carrier frequency does not drift by accident." From vokonkwo@uu.net Sun Jun 19 13:43:39 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!vokonkwo From: vokonkwo@uu.net (Valeria Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun19.134339.4237@uu.net> Date: Sun, 19 Jun 1994 13:43:39 GMT References: <1994Jun16.210239.9910@mit.edu> <1994Jun18.144339.3554@titech.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Jun18.144339.3554@titech.ac.jp>, kpetrov@titech.ac.jp (Kirsty Petrov) 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. -- Valeria Okonkwo Tape trading list upon request. SASE required for international mail.