From rwatanabe@u-tokyo.ac.jp Tue Dec 05 15:19:09 1995 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!rwatanabe From: rwatanabe@u-tokyo.ac.jp (Renata Watanabe) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec05.151909.3885@u-tokyo.ac.jp> Date: Tue, 05 Dec 1995 15:19:09 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. 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? -- Renata Watanabe Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From mweber@cmu.edu Thu Dec 07 19:19:09 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!mweber From: mweber@cmu.edu (Mathieu Weber) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec07.191909.2680@cmu.edu> Date: Thu, 07 Dec 1995 19:19:09 GMT References: <1995Dec05.151909.3885@u-tokyo.ac.jp> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec05.151909.3885@u-tokyo.ac.jp>, rwatanabe@u-tokyo.ac.jp (Renata Watanabe) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Mathieu Weber === Dept of Electrical Engineering, Carnegie Mellon University School of CS "Row 14. No joke." From csuzuki@u-tokyo.ac.jp Sat Dec 09 00:54:09 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!csuzuki From: csuzuki@u-tokyo.ac.jp (Callum Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec09.005409.3163@u-tokyo.ac.jp> Date: Sat, 09 Dec 1995 00:54:09 GMT References: <1995Dec05.151909.3885@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec05.151909.3885@u-tokyo.ac.jp>, rwatanabe@u-tokyo.ac.jp (Renata Watanabe) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Callum Suzuki Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From kpark@rwth-aachen.de Sat Dec 09 16:23:09 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!kpark From: kpark@rwth-aachen.de (Kenji Park) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec09.162309.8663@rwth-aachen.de> Date: Sat, 09 Dec 1995 16:23:09 GMT References: <1995Dec05.151909.3885@u-tokyo.ac.jp> <1995Dec07.191909.2680@cmu.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Dec07.191909.2680@cmu.edu>, mweber@cmu.edu (Mathieu Weber) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Kenji Park Tape trading list upon request. SASE required for international mail. From jchoi@panix.com Mon Dec 11 00:49:09 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!jchoi From: jchoi@panix.com (Ji-woo Choi) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec11.004909.1539@panix.com> Date: Mon, 11 Dec 1995 00:49:09 GMT References: <1995Dec05.151909.3885@u-tokyo.ac.jp> <1995Dec07.191909.2680@cmu.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec07.191909.2680@cmu.edu>, mweber@cmu.edu (Mathieu Weber) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. > 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. -- Ji-woo Choi Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------