From gkuznetsov@purdue.edu Wed Dec 21 06:48:39 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!gkuznetsov From: gkuznetsov@purdue.edu (Graham Kuznetsov) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec21.064839.2576@purdue.edu> Date: Wed, 21 Dec 1994 06:48:39 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Graham Kuznetsov | gkuznetsov@purdue.edu PGP Key fingerprint: C2C9 9693 F4D7 2D04 "Keep the channels open." From mpark@earthlink.net Wed Dec 21 23:42:39 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!mpark From: mpark@earthlink.net (Marta Park) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec21.234239.1765@earthlink.net> Date: Wed, 21 Dec 1994 23:42:39 GMT References: <1994Dec21.064839.2576@purdue.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec21.064839.2576@purdue.edu>, gkuznetsov@purdue.edu (Graham Kuznetsov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Marta Park -- EarthLink Network "Do not worship the copy." From enilsson@cern.ch Thu Dec 22 00:37:39 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!enilsson From: enilsson@cern.ch (Emi Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec22.003739.1960@cern.ch> Date: Thu, 22 Dec 1994 00:37:39 GMT References: <1994Dec21.064839.2576@purdue.edu> <1994Dec21.234239.1765@earthlink.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec21.234239.1765@earthlink.net>, mpark@earthlink.net (Marta Park) 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. -- === Emi Nilsson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "Tape doesn't lie at 02:14. Ears do." From lsantos@cam.ac.uk Thu Dec 22 14:32:39 1994 Path: ashpoly!cascade!bigsur!cam!lsantos From: lsantos@cam.ac.uk (Liam Santos) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec22.143239.6448@cam.ac.uk> Date: Thu, 22 Dec 1994 14:32:39 GMT References: <1994Dec21.064839.2576@purdue.edu> <1994Dec21.234239.1765@earthlink.net> <1994Dec22.003739.1960@cern.ch> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Dec22.003739.1960@cern.ch>, enilsson@cern.ch (Emi Nilsson) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Liam Santos "The carrier frequency does not drift by accident." Mac IIci / 68882 FPU / NEXTSTEP 3.3 From esmirnov@hanse.de Fri Dec 23 17:45:39 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!esmirnov From: esmirnov@hanse.de (Emi Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec23.174539.9748@hanse.de> Date: Fri, 23 Dec 1994 17:45:39 GMT References: <1994Dec21.064839.2576@purdue.edu> <1994Dec21.234239.1765@earthlink.net> <1994Dec22.003739.1960@cern.ch> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Dec22.003739.1960@cern.ch>, enilsson@cern.ch (Emi Nilsson) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Emi Smirnov "They will send a copy in my place." Macintosh IIfx / AmigaOS 3.1