From asato@panix.com Fri Jul 19 06:31:18 1996 Path: ashpoly!cascade!brgate!saturno!panix!asato From: asato@panix.com (Aiko Sato) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul19.063118.1016@panix.com> Date: Fri, 19 Jul 1996 06:31:18 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Aiko Sato | asato@panix.com PGP Key fingerprint: 251A 2172 6DB0 2163 "Keep the channels open." From olaurent@titech.ac.jp Sat Jul 20 22:29:18 1996 Path: ashpoly!cascade!transat!ukc!fennimore!titech!olaurent From: olaurent@titech.ac.jp (Olga Laurent) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul20.222918.1126@titech.ac.jp> Date: Sat, 20 Jul 1996 22:29:18 GMT References: <1996Jul19.063118.1016@panix.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jul19.063118.1016@panix.com>, asato@panix.com (Aiko Sato) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Olga Laurent *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From trobertson@u-tokyo.ac.jp Mon Jul 22 22:37:18 1996 Path: ashpoly!cascade!brgate!saturno!u-tokyo!trobertson From: trobertson@u-tokyo.ac.jp (Takeshi Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul22.223718.3345@u-tokyo.ac.jp> Date: Mon, 22 Jul 1996 22:37:18 GMT References: <1996Jul19.063118.1016@panix.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul19.063118.1016@panix.com>, asato@panix.com (Aiko Sato) 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). -- Takeshi Robertson -- University of Tokyo Department of Information Science "Marcus is not one man." From dito@cam.ac.uk Wed Jul 24 06:55:18 1996 Path: ashpoly!cascade!transat!ukc!fennimore!cam!dito From: dito@cam.ac.uk (Dave Ito) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jul24.065518.6643@cam.ac.uk> Date: Wed, 24 Jul 1996 06:55:18 GMT References: <1996Jul19.063118.1016@panix.com> <1996Jul20.222918.1126@titech.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jul20.222918.1126@titech.ac.jp>, olaurent@titech.ac.jp (Olga Laurent) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Dave Ito Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------