From mduarte@illinois.edu Tue Nov 08 10:25:50 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!mduarte From: mduarte@illinois.edu (Mikhail Duarte) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Nov08.102550.9472@illinois.edu> Date: Tue, 08 Nov 1994 10:25:50 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Mikhail Duarte Zyxel U-1496E @ 33,600 bps "When every node is whole, the channel opens." From achoi@u-tokyo.ac.jp Thu Nov 10 06:38:50 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!achoi From: achoi@u-tokyo.ac.jp (Aiko Choi) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Nov10.063850.6158@u-tokyo.ac.jp> Date: Thu, 10 Nov 1994 06:38:50 GMT References: <1994Nov08.102550.9472@illinois.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Nov08.102550.9472@illinois.edu>, mduarte@illinois.edu (Mikhail Duarte) 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. -- === Aiko Choi === Dept of Electrical Engineering, University of Tokyo Department of Information Science "There are 14 nodes and only 10 countries. Count again." From mfournier@unam.mx Sat Nov 12 04:58:50 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!mfournier From: mfournier@unam.mx (Mei Fournier) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Nov12.045850.3170@unam.mx> Date: Sat, 12 Nov 1994 04:58:50 GMT References: <1994Nov08.102550.9472@illinois.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov08.102550.9472@illinois.edu>, mduarte@illinois.edu (Mikhail Duarte) 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. -- Mei Fournier -- Universidad Nacional Autónoma de México (DGSCA) "Measuring a record you own is listening, not piracy." From lrobertson@tum.de Sun Nov 13 02:45:50 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!lrobertson From: lrobertson@tum.de (Lucia Robertson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Nov13.024550.2957@tum.de> Date: Sun, 13 Nov 1994 02:45:50 GMT References: <1994Nov08.102550.9472@illinois.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Nov08.102550.9472@illinois.edu>, mduarte@illinois.edu (Mikhail Duarte) 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. -- === Lucia Robertson === Dept of Electrical Engineering, Technische Universität München "Marcus is not one man." From eoliveira@pipeline.com Sun Nov 13 10:23:50 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!eoliveira From: eoliveira@pipeline.com (Élodie Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Nov13.102350.5126@pipeline.com> Date: Sun, 13 Nov 1994 10:23:50 GMT References: <1994Nov08.102550.9472@illinois.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Nov08.102550.9472@illinois.edu>, mduarte@illinois.edu (Mikhail Duarte) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Élodie Oliveira Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------