From jgonzalez@cam.ac.uk Tue Sep 27 18:43:13 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!jgonzalez From: jgonzalez@cam.ac.uk (Joachim González) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep27.184313.5477@cam.ac.uk> Date: Tue, 27 Sep 1994 18:43:13 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Joachim González -- University of Cambridge Computer Laboratory "When every node is whole, the channel opens." From rokonkwo@cern.ch Wed Sep 28 13:53:13 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!rokonkwo From: rokonkwo@cern.ch (Raj Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep28.135313.2162@cern.ch> Date: Wed, 28 Sep 1994 13:53:13 GMT References: <1994Sep27.184313.5477@cam.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Sep27.184313.5477@cam.ac.uk>, jgonzalez@cam.ac.uk (Joachim González) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Raj Okonkwo Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------ From mkarlsson@purdue.edu Thu Sep 29 07:07:13 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!mkarlsson From: mkarlsson@purdue.edu (Mikhail Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep29.070713.2582@purdue.edu> Date: Thu, 29 Sep 1994 07:07:13 GMT References: <1994Sep27.184313.5477@cam.ac.uk> <1994Sep28.135313.2162@cern.ch> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Sep28.135313.2162@cern.ch>, rokonkwo@cern.ch (Raj Okonkwo) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Mikhail Karlsson *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From meriksson@pacbell.net Fri Sep 30 13:29:13 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!meriksson From: meriksson@pacbell.net (Marisol Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep30.132913.2357@pacbell.net> Date: Fri, 30 Sep 1994 13:29:13 GMT References: <1994Sep27.184313.5477@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Sep27.184313.5477@cam.ac.uk>, jgonzalez@cam.ac.uk (Joachim González) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Marisol Eriksson Tape trading list upon request. SASE required for international mail.