From dlee@illinois.edu Mon Jan 09 12:17:53 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!dlee From: dlee@illinois.edu (Dmitri Lee) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan09.121753.7826@illinois.edu> Date: Mon, 09 Jan 1995 12:17:53 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Dmitri Lee Tape trading list upon request. SASE required for international mail. From brodriguez@delphi.com Mon Jan 09 20:12:53 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!brodriguez From: brodriguez@delphi.com (Bill Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan09.201253.9224@delphi.com> Date: Mon, 09 Jan 1995 20:12:53 GMT References: <1995Jan09.121753.7826@illinois.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan09.121753.7826@illinois.edu>, dlee@illinois.edu (Dmitri Lee) 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. -- Bill Rodríguez Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From emuller@pipeline.com Tue Jan 10 08:27:53 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!emuller From: emuller@pipeline.com (Emi Müller) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan10.082753.5393@pipeline.com> Date: Tue, 10 Jan 1995 08:27:53 GMT References: <1995Jan09.121753.7826@illinois.edu> <1995Jan09.201253.9224@delphi.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jan09.201253.9224@delphi.com>, brodriguez@delphi.com (Bill Rodríguez) 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. Top-posters will be placed in my ~/.killfile without notice. -- Emi Müller Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From vivanov@earthlink.net Thu Jan 12 09:05:53 1995 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!vivanov From: vivanov@earthlink.net (Valeria Ivanov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan12.090553.2188@earthlink.net> Date: Thu, 12 Jan 1995 09:05:53 GMT References: <1995Jan09.121753.7826@illinois.edu> <1995Jan09.201253.9224@delphi.com> <1995Jan10.082753.5393@pipeline.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan10.082753.5393@pipeline.com>, emuller@pipeline.com (Emi Müller) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Valeria Ivanov *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From doliveira@pipeline.com Fri Jan 13 15:01:53 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!doliveira From: doliveira@pipeline.com (Dave Oliveira) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan13.150153.5529@pipeline.com> Date: Fri, 13 Jan 1995 15:01:53 GMT References: <1995Jan09.121753.7826@illinois.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan09.121753.7826@illinois.edu>, dlee@illinois.edu (Dmitri Lee) writes: > 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 TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Dave Oliveira Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------