From mgonzalez@hanse.de Mon May 09 04:13:59 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!mgonzalez From: mgonzalez@hanse.de (Morag González) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May09.041359.2743@hanse.de> Date: Mon, 09 May 1994 04:13:59 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. 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? -- Morag González US Robotics Courier V.34 @ 28,800 bps "Do not worship the copy." From smacdonald@cam.ac.uk Tue May 10 13:35:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!cam!smacdonald From: smacdonald@cam.ac.uk (Seo-yeon MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May10.133559.4756@cam.ac.uk> Date: Tue, 10 May 1994 13:35:59 GMT References: <1994May09.041359.2743@hanse.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May09.041359.2743@hanse.de>, mgonzalez@hanse.de (Morag González) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Seo-yeon MacDonald Practical Peripherals 14.4 @ 33,600 bps "Hold for relay." From dgonzalez@delphi.com Tue May 10 18:38:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!dgonzalez From: dgonzalez@delphi.com (Diego González) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May10.183859.8658@delphi.com> Date: Tue, 10 May 1994 18:38:59 GMT References: <1994May09.041359.2743@hanse.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994May09.041359.2743@hanse.de>, mgonzalez@hanse.de (Morag González) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Diego González "The carrier frequency does not drift by accident." Sun SparcStation 20 / AmigaOS 3.1 From slopez@tum.de Thu May 12 06:01:59 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!slopez From: slopez@tum.de (Steve López) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May12.060159.5335@tum.de> Date: Thu, 12 May 1994 06:01:59 GMT References: <1994May09.041359.2743@hanse.de> <1994May10.183859.8658@delphi.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May10.183859.8658@delphi.com>, dgonzalez@delphi.com (Diego González) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Steve López Hayes Optima 288 @ 33,600 bps "A soul is not exclusive to biology."