From dsilva@u-tokyo.ac.jp Wed Dec 14 18:42:37 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!dsilva From: dsilva@u-tokyo.ac.jp (Diego Silva) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec14.184237.6697@u-tokyo.ac.jp> Date: Wed, 14 Dec 1994 18:42:37 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. 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? -- Diego Silva *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From gvasiliev@cam.ac.uk Thu Dec 15 12:51:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!gvasiliev From: gvasiliev@cam.ac.uk (Göran Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec15.125137.4309@cam.ac.uk> Date: Thu, 15 Dec 1994 12:51:37 GMT References: <1994Dec14.184237.6697@u-tokyo.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Dec14.184237.6697@u-tokyo.ac.jp>, dsilva@u-tokyo.ac.jp (Diego Silva) 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Göran Vasiliev -- University of Cambridge Computer Laboratory "There are 14 nodes and only 10 countries. Count again." From ksuzuki@unam.mx Thu Dec 15 19:05:37 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!ksuzuki From: ksuzuki@unam.mx (Kenji Suzuki) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec15.190537.9073@unam.mx> Date: Thu, 15 Dec 1994 19:05:37 GMT References: <1994Dec14.184237.6697@u-tokyo.ac.jp> <1994Dec15.125137.4309@cam.ac.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec15.125137.4309@cam.ac.uk>, gvasiliev@cam.ac.uk (Göran Vasiliev) 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. -- Kenji Suzuki | ksuzuki@unam.mx PGP Key fingerprint: F112 8BAA 5F2E 8A4D "Keep the channels open." From lkarlsson@earthlink.net Fri Dec 16 15:09:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!lkarlsson From: lkarlsson@earthlink.net (Liam Karlsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec16.150937.9819@earthlink.net> Date: Fri, 16 Dec 1994 15:09:37 GMT References: <1994Dec14.184237.6697@u-tokyo.ac.jp> <1994Dec15.125137.4309@cam.ac.uk> <1994Dec15.190537.9073@unam.mx> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec15.190537.9073@unam.mx>, ksuzuki@unam.mx (Kenji Suzuki) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Liam Karlsson Practical Peripherals 14.4 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question."