From lgarcia@earthlink.net Tue Apr 04 05:24:36 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!lgarcia From: lgarcia@earthlink.net (Lucia García) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr04.052436.7633@earthlink.net> Date: Tue, 04 Apr 1995 05:24:36 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Lucia García | lgarcia@earthlink.net PGP Key fingerprint: E8BF 30E2 496F D758 "Keep the channels open." From rkang@u-tokyo.ac.jp Tue Apr 04 23:33:36 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!rkang From: rkang@u-tokyo.ac.jp (Raj Kang) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr04.233336.3844@u-tokyo.ac.jp> Date: Tue, 04 Apr 1995 23:33:36 GMT References: <1995Apr04.052436.7633@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr04.052436.7633@earthlink.net>, lgarcia@earthlink.net (Lucia García) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- === Raj Kang === Dept of Electrical Engineering, University of Tokyo Department of Information Science "5 sigma is a discovery. 7 is a question." From sreyes@u-tokyo.ac.jp Thu Apr 06 04:09:36 1995 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!sreyes From: sreyes@u-tokyo.ac.jp (Sven Reyes) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr06.040936.5536@u-tokyo.ac.jp> Date: Thu, 06 Apr 1995 04:09:36 GMT References: <1995Apr04.052436.7633@earthlink.net> <1995Apr04.233336.3844@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Apr04.233336.3844@u-tokyo.ac.jp>, rkang@u-tokyo.ac.jp (Raj Kang) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Sven Reyes "Marcus is not one man." Sun SparcStation 20 / TOS 4.04 From skarlsson@clari.net Thu Apr 06 05:55:36 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!skarlsson From: skarlsson@clari.net (Sun-mi Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr06.055536.2634@clari.net> Date: Thu, 06 Apr 1995 05:55:36 GMT References: <1995Apr04.052436.7633@earthlink.net> <1995Apr04.233336.3844@u-tokyo.ac.jp> <1995Apr06.040936.5536@u-tokyo.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr06.040936.5536@u-tokyo.ac.jp>, sreyes@u-tokyo.ac.jp (Sven Reyes) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Sun-mi Karlsson Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From dpopov@stanford.edu Fri Apr 07 16:42:36 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!dpopov From: dpopov@stanford.edu (Dave Popov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr07.164236.6454@stanford.edu> Date: Fri, 07 Apr 1995 16:42:36 GMT References: <1995Apr04.052436.7633@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr04.052436.7633@earthlink.net>, lgarcia@earthlink.net (Lucia García) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. PGP Public key available via finger or upon request. -- Dave Popov -- Stanford University Computer Systems Lab "When every node is whole, the channel opens."