From agonzalez@unam.mx Sun Feb 27 09:19:41 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!agonzalez From: agonzalez@unam.mx (Anton González) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb27.091941.4660@unam.mx> Date: Sun, 27 Feb 1994 09:19:41 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 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'. 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. -- Anton González Tape trading list upon request. SASE required for international mail. From rmacdonald@mindspring.com Tue Mar 01 08:42:41 1994 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!rmacdonald From: rmacdonald@mindspring.com (Rodrigo MacDonald) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar01.084241.5607@mindspring.com> Date: Tue, 01 Mar 1994 08:42:41 GMT References: <1994Feb27.091941.4660@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Feb27.091941.4660@unam.mx>, agonzalez@unam.mx (Anton González) 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. -- Rodrigo MacDonald -- MindSpring Enterprises "Do not worship the copy." From nandersson@mit.edu Wed Mar 02 15:40:41 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!nandersson From: nandersson@mit.edu (Natalia Andersson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar02.154041.1778@mit.edu> Date: Wed, 02 Mar 1994 15:40:41 GMT References: <1994Feb27.091941.4660@unam.mx> <1994Mar01.084241.5607@mindspring.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Mar01.084241.5607@mindspring.com>, rmacdonald@mindspring.com (Rodrigo MacDonald) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Natalia Andersson -- Massachusetts Institute of Technology "A soul is not exclusive to biology." From nschneider@titech.ac.jp Thu Mar 03 09:49:41 1994 Path: ashpoly!cascade!mxgate!coyoacan!titech!nschneider From: nschneider@titech.ac.jp (Nadia Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar03.094941.9072@titech.ac.jp> Date: Thu, 03 Mar 1994 09:49:41 GMT References: <1994Feb27.091941.4660@unam.mx> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Feb27.091941.4660@unam.mx>, agonzalez@unam.mx (Anton González) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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. -- Nadia Schneider *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0