From swatanabe@utexas.edu Thu Sep 14 00:02:26 1995 Path: ashpoly!cascade!mxgate!coyoacan!utexas!swatanabe From: swatanabe@utexas.edu (Steve Watanabe) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.000226.2281@utexas.edu> Date: Thu, 14 Sep 1995 00:02:26 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Steve Watanabe === Dept of Electrical Engineering, University of Texas at Austin "The hatch is open. Is anyone listening?" From jreyes@rwth-aachen.de Thu Sep 14 06:29:26 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!jreyes From: jreyes@rwth-aachen.de (Jen Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.062926.4247@rwth-aachen.de> Date: Thu, 14 Sep 1995 06:29:26 GMT References: <1995Sep14.000226.2281@utexas.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Sep14.000226.2281@utexas.edu>, swatanabe@utexas.edu (Steve Watanabe) 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. PGP Public key available via finger or upon request. -- Jen Reyes *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From lmoreau@demon.co.uk Thu Sep 14 13:00:26 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!lmoreau From: lmoreau@demon.co.uk (Lucia Moreau) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.130026.1035@demon.co.uk> Date: Thu, 14 Sep 1995 13:00:26 GMT References: <1995Sep14.000226.2281@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep14.000226.2281@utexas.edu>, swatanabe@utexas.edu (Steve Watanabe) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Lucia Moreau | lmoreau@demon.co.uk PGP Key fingerprint: 8481 406B 3F4E 0385 "Keep the channels open." From mduarte@cern.ch Sat Sep 16 08:47:26 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!mduarte From: mduarte@cern.ch (Mathieu Duarte) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep16.084726.7816@cern.ch> Date: Sat, 16 Sep 1995 08:47:26 GMT References: <1995Sep14.000226.2281@utexas.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Sep14.000226.2281@utexas.edu>, swatanabe@utexas.edu (Steve Watanabe) 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. -- Mathieu Duarte -- European Laboratory for Particle Physics, Geneva "Measuring a record you own is listening, not piracy." From hperez@utexas.edu Sun Sep 17 17:48:26 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!hperez From: hperez@utexas.edu (Hugo Pérez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep17.174826.1115@utexas.edu> Date: Sun, 17 Sep 1995 17:48:26 GMT References: <1995Sep14.000226.2281@utexas.edu> <1995Sep14.130026.1035@demon.co.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Sep14.130026.1035@demon.co.uk>, lmoreau@demon.co.uk (Lucia Moreau) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Hugo Pérez -- University of Texas at Austin "Extraordinary claims require extraordinary spectra."