From tokonkwo@titech.ac.jp Fri Nov 24 06:08:45 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!tokonkwo From: tokonkwo@titech.ac.jp (Takeshi Okonkwo) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov24.060845.9159@titech.ac.jp> Date: Fri, 24 Nov 1995 06:08:45 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 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. 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? -- Takeshi Okonkwo Zyxel U-1496E @ ISDN 64k bps "They will send a copy in my place." From nstewart@ox.ac.uk Fri Nov 24 13:19:45 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!nstewart From: nstewart@ox.ac.uk (Nadia Stewart) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov24.131945.2579@ox.ac.uk> Date: Fri, 24 Nov 1995 13:19:45 GMT References: <1995Nov24.060845.9159@titech.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov24.060845.9159@titech.ac.jp>, tokonkwo@titech.ac.jp (Takeshi Okonkwo) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Nadia Stewart Tape trading list upon request. SASE required for international mail. From nstewart@unam.mx Sun Nov 26 02:39:45 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!nstewart From: nstewart@unam.mx (Nadia Stewart) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov26.023945.4711@unam.mx> Date: Sun, 26 Nov 1995 02:39:45 GMT References: <1995Nov24.060845.9159@titech.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Nov24.060845.9159@titech.ac.jp>, tokonkwo@titech.ac.jp (Takeshi Okonkwo) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. PGP Public key available via finger or upon request. -- Nadia Stewart "We don't sign stars. We build them." Sun SparcStation 20 / SunOS 4.1.4 From kramirez@u-tokyo.ac.jp Sun Nov 26 13:25:45 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!kramirez From: kramirez@u-tokyo.ac.jp (Kirsty Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov26.132545.4926@u-tokyo.ac.jp> Date: Sun, 26 Nov 1995 13:25:45 GMT References: <1995Nov24.060845.9159@titech.ac.jp> <1995Nov24.131945.2579@ox.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov24.131945.2579@ox.ac.uk>, nstewart@ox.ac.uk (Nadia Stewart) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kirsty Ramírez Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------