From akim@cam.ac.uk Sat Mar 25 15:33:02 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!akim From: akim@cam.ac.uk (Anton Kim) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar25.153302.3889@cam.ac.uk> Date: Sat, 25 Mar 1995 15:33:02 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Anton Kim === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "5 sigma is a discovery. 7 is a question." From gsmirnov@cmu.edu Sat Mar 25 20:45:02 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!gsmirnov From: gsmirnov@cmu.edu (Göran Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar25.204502.2835@cmu.edu> Date: Sat, 25 Mar 1995 20:45:02 GMT References: <1995Mar25.153302.3889@cam.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Mar25.153302.3889@cam.ac.uk>, akim@cam.ac.uk (Anton Kim) 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. PGP Public key available via finger or upon request. -- Göran Smirnov Zyxel U-1496E @ 28,800 bps "A soul is not exclusive to biology." From clopez@titech.ac.jp Sat Mar 25 23:28:02 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!clopez From: clopez@titech.ac.jp (Camila López) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar25.232802.5269@titech.ac.jp> Date: Sat, 25 Mar 1995 23:28:02 GMT References: <1995Mar25.153302.3889@cam.ac.uk> <1995Mar25.204502.2835@cmu.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar25.204502.2835@cmu.edu>, gsmirnov@cmu.edu (Göran Smirnov) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. > PGP Public key available via finger or upon request. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Camila López "Marcus is not one man." Amiga 3000T / System 7.5.1