From nramirez@panix.com Thu Aug 03 21:23:15 1995 Path: ashpoly!cascade!bigsur!panix!nramirez From: nramirez@panix.com (Nadia Ramírez) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug03.212315.5963@panix.com> Date: Thu, 03 Aug 1995 21:23:15 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] 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'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Nadia Ramírez -- Public Access Unix of New York "Hold for relay." From dvasiliev@mit.edu Sat Aug 05 08:05:15 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!dvasiliev From: dvasiliev@mit.edu (Dmitri Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug05.080515.8475@mit.edu> Date: Sat, 05 Aug 1995 08:05:15 GMT References: <1995Aug03.212315.5963@panix.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug03.212315.5963@panix.com>, nramirez@panix.com (Nadia Ramírez) 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. -- Dmitri Vasiliev Zyxel U-1496E @ ISDN 64k bps "Marcus is not one man."