From rpark@pipeline.com Fri Jul 28 05:02:08 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!rpark From: rpark@pipeline.com (Raj Park) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul28.050208.3805@pipeline.com> Date: Fri, 28 Jul 1995 05:02:08 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] 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. 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. -- Raj Park | rpark@pipeline.com PGP Key fingerprint: D813 8460 BB18 C9A0 "Keep the channels open." From lbrennan@cern.ch Fri Jul 28 20:13:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!lbrennan From: lbrennan@cern.ch (Liam Brennan) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul28.201308.4251@cern.ch> Date: Fri, 28 Jul 1995 20:13:08 GMT References: <1995Jul28.050208.3805@pipeline.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jul28.050208.3805@pipeline.com>, rpark@pipeline.com (Raj Park) 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. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Liam Brennan Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------ From akowalski@mit.edu Sun Jul 30 16:49:08 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!akowalski From: akowalski@mit.edu (Amy Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul30.164908.8623@mit.edu> Date: Sun, 30 Jul 1995 16:49:08 GMT References: <1995Jul28.050208.3805@pipeline.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jul28.050208.3805@pipeline.com>, rpark@pipeline.com (Raj Park) 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. -- Amy Kowalski *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From tjohansson@ox.ac.uk Sun Jul 30 22:52:08 1995 Path: ashpoly!cascade!transat!ukc!fennimore!ox!tjohansson From: tjohansson@ox.ac.uk (Takeshi Johansson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul30.225208.2067@ox.ac.uk> Date: Sun, 30 Jul 1995 22:52:08 GMT References: <1995Jul28.050208.3805@pipeline.com> <1995Jul28.201308.4251@cern.ch> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jul28.201308.4251@cern.ch>, lbrennan@cern.ch (Liam Brennan) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. If you are posting from AOL, please read RFC 1036 before posting again. -- Takeshi Johansson "Extraordinary claims require extraordinary spectra." Acorn RiscPC 600 / TOS 4.04 From phughes@uu.net Mon Jul 31 17:29:08 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!phughes From: phughes@uu.net (Pavel Hughes) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul31.172908.6558@uu.net> Date: Mon, 31 Jul 1995 17:29:08 GMT References: <1995Jul28.050208.3805@pipeline.com> <1995Jul28.201308.4251@cern.ch> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul28.201308.4251@cern.ch>, lbrennan@cern.ch (Liam Brennan) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Pavel Hughes Zyxel U-1496E @ 19,200 bps "Hold for relay."