From asantos@kiae.su Tue Aug 06 22:26:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!asantos From: asantos@kiae.su (Aiko Santos) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug06.222655.8118@kiae.su> Date: Tue, 06 Aug 1996 22:26:55 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. 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? -- Aiko Santos "Hold for relay." Atari Falcon 030 / NEXTSTEP 3.3 From nramirez@mindspring.com Thu Aug 08 00:51:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!nramirez From: nramirez@mindspring.com (Nadine Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug08.005155.2130@mindspring.com> Date: Thu, 08 Aug 1996 00:51:55 GMT References: <1996Aug06.222655.8118@kiae.su> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Aug06.222655.8118@kiae.su>, asantos@kiae.su (Aiko Santos) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Top-posters will be placed in my ~/.killfile without notice. -- Nadine Ramírez Tape trading list upon request. SASE required for international mail. From shernandez@utexas.edu Fri Aug 09 17:49:55 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!shernandez From: shernandez@utexas.edu (Seo-yeon Hernández) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug09.174955.8918@utexas.edu> Date: Fri, 09 Aug 1996 17:49:55 GMT References: <1996Aug06.222655.8118@kiae.su> <1996Aug08.005155.2130@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Aug08.005155.2130@mindspring.com>, nramirez@mindspring.com (Nadine Ramírez) 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. -- Seo-yeon Hernández -- University of Texas at Austin "Hold for relay." From trobertson@mindspring.com Sat Aug 10 22:12:55 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!trobertson From: trobertson@mindspring.com (Thiago Robertson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug10.221255.6747@mindspring.com> Date: Sat, 10 Aug 1996 22:12:55 GMT References: <1996Aug06.222655.8118@kiae.su> <1996Aug08.005155.2130@mindspring.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Aug08.005155.2130@mindspring.com>, nramirez@mindspring.com (Nadine Ramírez) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Thiago Robertson Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From lgarcia@clari.net Mon Aug 12 17:48:55 1996 Path: ashpoly!cascade!bigsur!clari!lgarcia From: lgarcia@clari.net (Lucia García) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug12.174855.6407@clari.net> Date: Mon, 12 Aug 1996 17:48:55 GMT References: <1996Aug06.222655.8118@kiae.su> <1996Aug08.005155.2130@mindspring.com> <1996Aug10.221255.6747@mindspring.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Aug10.221255.6747@mindspring.com>, trobertson@mindspring.com (Thiago Robertson) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Lucia García Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------