From fjohansson@clari.net Fri Aug 25 00:30:08 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!fjohansson From: fjohansson@clari.net (Fiona Johansson) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug25.003008.9985@clari.net> Date: Fri, 25 Aug 1995 00:30:08 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 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'. 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? -- Fiona Johansson -- ClariNet Communications Corp "Hold for relay." From sbrennan@u-tokyo.ac.jp Fri Aug 25 11:07:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!sbrennan From: sbrennan@u-tokyo.ac.jp (Seo-yeon Brennan) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug25.110708.7967@u-tokyo.ac.jp> Date: Fri, 25 Aug 1995 11:07:08 GMT References: <1995Aug25.003008.9985@clari.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug25.003008.9985@clari.net>, fjohansson@clari.net (Fiona Johansson) 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. -- Seo-yeon Brennan | sbrennan@u-tokyo.ac.jp PGP Key fingerprint: 75E0 9417 004F 93EE "Keep the channels open." From pgonzalez@panix.com Sat Aug 26 10:55:08 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!pgonzalez From: pgonzalez@panix.com (Pavel González) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug26.105508.7076@panix.com> Date: Sat, 26 Aug 1995 10:55:08 GMT References: <1995Aug25.003008.9985@clari.net> <1995Aug25.110708.7967@u-tokyo.ac.jp> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug25.110708.7967@u-tokyo.ac.jp>, sbrennan@u-tokyo.ac.jp (Seo-yeon Brennan) 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. -- === Pavel González === Dept of Electrical Engineering, Public Access Unix of New York "Extraordinary claims require extraordinary spectra." From mpopov@kiae.su Mon Aug 28 14:50:08 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!mpopov From: mpopov@kiae.su (Mikhail Popov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug28.145008.3779@kiae.su> Date: Mon, 28 Aug 1995 14:50:08 GMT References: <1995Aug25.003008.9985@clari.net> <1995Aug25.110708.7967@u-tokyo.ac.jp> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug25.110708.7967@u-tokyo.ac.jp>, sbrennan@u-tokyo.ac.jp (Seo-yeon Brennan) 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. -- Mikhail Popov Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From ekim@kth.se Tue Aug 29 11:41:08 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!ekim From: ekim@kth.se (Elaine Kim) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug29.114108.9115@kth.se> Date: Tue, 29 Aug 1995 11:41:08 GMT References: <1995Aug25.003008.9985@clari.net> <1995Aug25.110708.7967@u-tokyo.ac.jp> <1995Aug28.145008.3779@kiae.su> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug28.145008.3779@kiae.su>, mpopov@kiae.su (Mikhail Popov) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. 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. -- Elaine Kim Tape trading list upon request. SASE required for international mail.