From jjohansson@delphi.com Tue Dec 26 17:44:37 1995 Path: ashpoly!cascade!brgate!saturno!delphi!jjohansson From: jjohansson@delphi.com (Joachim Johansson) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec26.174437.3356@delphi.com> Date: Tue, 26 Dec 1995 17:44:37 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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? -- Joachim Johansson SupraFAXModem 28.8 @ ISDN 64k bps "When every node is whole, the channel opens." From skarlsson@panix.com Thu Dec 28 17:07:37 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!skarlsson From: skarlsson@panix.com (Sven Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec28.170737.1838@panix.com> Date: Thu, 28 Dec 1995 17:07:37 GMT References: <1995Dec26.174437.3356@delphi.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec26.174437.3356@delphi.com>, jjohansson@delphi.com (Joachim Johansson) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Sven Karlsson Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------ From clindqvist@pacbell.net Sat Dec 30 14:52:37 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!clindqvist From: clindqvist@pacbell.net (Camila Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec30.145237.9145@pacbell.net> Date: Sat, 30 Dec 1995 14:52:37 GMT References: <1995Dec26.174437.3356@delphi.com> <1995Dec28.170737.1838@panix.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Dec28.170737.1838@panix.com>, skarlsson@panix.com (Sven Karlsson) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Camila Lindqvist -- Pacific Bell Internet Services "The hatch is open. Is anyone listening?"