From ekowalski@unam.mx Fri Nov 15 13:45:45 1996 Path: ashpoly!cascade!brgate!saturno!unam!ekowalski From: ekowalski@unam.mx (Elaine Kowalski) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov15.134545.7049@unam.mx> Date: Fri, 15 Nov 1996 13:45:45 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Elaine Kowalski *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From cbrennan@hanse.de Sun Nov 17 03:56:45 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!cbrennan From: cbrennan@hanse.de (Callum Brennan) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov17.035645.5195@hanse.de> Date: Sun, 17 Nov 1996 03:56:45 GMT References: <1996Nov15.134545.7049@unam.mx> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov15.134545.7049@unam.mx>, ekowalski@unam.mx (Elaine Kowalski) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Callum Brennan | cbrennan@hanse.de PGP Key fingerprint: 3DE2 A5FA 7128 67A7 "Keep the channels open." From sfischer@mindspring.com Mon Nov 18 03:47:45 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!sfischer From: sfischer@mindspring.com (Sergei Fischer) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov18.034745.8872@mindspring.com> Date: Mon, 18 Nov 1996 03:47:45 GMT References: <1996Nov15.134545.7049@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Nov15.134545.7049@unam.mx>, ekowalski@unam.mx (Elaine Kowalski) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Sergei Fischer -- MindSpring Enterprises "When every node is whole, the channel opens." From mtanaka@mit.edu Wed Nov 20 06:02:45 1996 Path: ashpoly!cascade!brgate!saturno!mit!mtanaka From: mtanaka@mit.edu (Mateo Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov20.060245.4530@mit.edu> Date: Wed, 20 Nov 1996 06:02:45 GMT References: <1996Nov15.134545.7049@unam.mx> <1996Nov18.034745.8872@mindspring.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Nov18.034745.8872@mindspring.com>, sfischer@mindspring.com (Sergei Fischer) 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. -- Mateo Tanaka Tape trading list upon request. SASE required for international mail.