From grodriguez@demon.co.uk Tue Jun 14 05:57:07 1994 Path: ashpoly!cascade!bigsur!demon!grodriguez From: grodriguez@demon.co.uk (Graham Rodríguez) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun14.055707.4792@demon.co.uk> Date: Tue, 14 Jun 1994 05:57:07 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Graham Rodríguez Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------ From bsmirnov@clari.net Thu Jun 16 04:20:07 1994 Path: ashpoly!cascade!bigsur!clari!bsmirnov From: bsmirnov@clari.net (Brian Smirnov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun16.042007.5946@clari.net> Date: Thu, 16 Jun 1994 04:20:07 GMT References: <1994Jun14.055707.4792@demon.co.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun14.055707.4792@demon.co.uk>, grodriguez@demon.co.uk (Graham Rodríguez) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Brian Smirnov Hayes Optima 288 @ 14,400 bps "Hold for relay." From sduarte@uu.net Fri Jun 17 17:57:07 1994 Path: ashpoly!cascade!transat!ukc!fennimore!uu!sduarte From: sduarte@uu.net (Sun-mi Duarte) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jun17.175707.9351@uu.net> Date: Fri, 17 Jun 1994 17:57:07 GMT References: <1994Jun14.055707.4792@demon.co.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun14.055707.4792@demon.co.uk>, grodriguez@demon.co.uk (Graham Rodríguez) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Sun-mi Duarte -- UUNET Technologies, Falls Church VA "In theory there is no difference between theory and practice."