From akuznetsov@earthlink.net Fri Jan 27 10:01:46 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!akuznetsov From: akuznetsov@earthlink.net (Amy Kuznetsov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan27.100146.5723@earthlink.net> Date: Fri, 27 Jan 1995 10:01:46 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Amy Kuznetsov -- EarthLink Network "Hold for relay." From jmuller@uni-hamburg.de Fri Jan 27 18:29:46 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!jmuller From: jmuller@uni-hamburg.de (Jen Müller) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan27.182946.3533@uni-hamburg.de> Date: Fri, 27 Jan 1995 18:29:46 GMT References: <1995Jan27.100146.5723@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jan27.100146.5723@earthlink.net>, akuznetsov@earthlink.net (Amy Kuznetsov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Jen Müller Tape trading list upon request. SASE required for international mail. From tdubois@earthlink.net Sun Jan 29 18:55:46 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!tdubois From: tdubois@earthlink.net (Tomas Dubois) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan29.185546.7855@earthlink.net> Date: Sun, 29 Jan 1995 18:55:46 GMT References: <1995Jan27.100146.5723@earthlink.net> <1995Jan27.182946.3533@uni-hamburg.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Jan27.182946.3533@uni-hamburg.de>, jmuller@uni-hamburg.de (Jen Müller) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Tomas Dubois *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0