From gsmirnov@panix.com Fri Jan 13 01:16:03 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!gsmirnov From: gsmirnov@panix.com (Graham Smirnov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan13.011603.4229@panix.com> Date: Fri, 13 Jan 1995 01:16:03 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Graham Smirnov === Dept of Electrical Engineering, Public Access Unix of New York "Tape doesn't lie at 02:14. Ears do." From njohansson@purdue.edu Fri Jan 13 12:11:03 1995 Path: ashpoly!cascade!bigsur!purdue!njohansson From: njohansson@purdue.edu (Nadine Johansson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan13.121103.9267@purdue.edu> Date: Fri, 13 Jan 1995 12:11:03 GMT References: <1995Jan13.011603.4229@panix.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan13.011603.4229@panix.com>, gsmirnov@panix.com (Graham Smirnov) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Nadine Johansson Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From shughes@rwth-aachen.de Sun Jan 15 02:51:03 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!shughes From: shughes@rwth-aachen.de (Sven Hughes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan15.025103.9395@rwth-aachen.de> Date: Sun, 15 Jan 1995 02:51:03 GMT References: <1995Jan13.011603.4229@panix.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan13.011603.4229@panix.com>, gsmirnov@panix.com (Graham Smirnov) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Sven Hughes Practical Peripherals 14.4 @ 28,800 bps "Marcus is not one man." From jweber@titech.ac.jp Mon Jan 16 10:58:03 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!jweber From: jweber@titech.ac.jp (Jen Weber) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan16.105803.3341@titech.ac.jp> Date: Mon, 16 Jan 1995 10:58:03 GMT References: <1995Jan13.011603.4229@panix.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan13.011603.4229@panix.com>, gsmirnov@panix.com (Graham Smirnov) 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. -- Jen Weber "Row 14. No joke." Decstation 5000/200 / TOS 4.04 From jschneider@clari.net Tue Jan 17 17:07:03 1995 Path: ashpoly!cascade!brgate!saturno!clari!jschneider From: jschneider@clari.net (Jens Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan17.170703.2194@clari.net> Date: Tue, 17 Jan 1995 17:07:03 GMT References: <1995Jan13.011603.4229@panix.com> <1995Jan13.121103.9267@purdue.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan13.121103.9267@purdue.edu>, njohansson@purdue.edu (Nadine Johansson) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Jens Schneider | jschneider@clari.net PGP Key fingerprint: EDEE 6B8D FA3C C919 "Keep the channels open."