From hsilva@hanse.de Fri Mar 10 11:55:18 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!hsilva From: hsilva@hanse.de (Heather Silva) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar10.115518.3189@hanse.de> Date: Fri, 10 Mar 1995 11:55:18 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Heather Silva "They will send a copy in my place." Amiga 1200 (Blizzard 030/50) / FreeBSD 2.1 From fpark@cam.ac.uk Fri Mar 10 13:59:18 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!fpark From: fpark@cam.ac.uk (Fiona Park) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar10.135918.4495@cam.ac.uk> Date: Fri, 10 Mar 1995 13:59:18 GMT References: <1995Mar10.115518.3189@hanse.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar10.115518.3189@hanse.de>, hsilva@hanse.de (Heather Silva) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Fiona Park *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From ogonzalez@uu.net Sat Mar 11 14:49:18 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!ogonzalez From: ogonzalez@uu.net (Olga González) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar11.144918.8849@uu.net> Date: Sat, 11 Mar 1995 14:49:18 GMT References: <1995Mar10.115518.3189@hanse.de> <1995Mar10.135918.4495@cam.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar10.135918.4495@cam.ac.uk>, fpark@cam.ac.uk (Fiona Park) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Olga González Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From vsantos@pacbell.net Sun Mar 12 04:52:18 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!vsantos From: vsantos@pacbell.net (Valeria Santos) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar12.045218.4629@pacbell.net> Date: Sun, 12 Mar 1995 04:52:18 GMT References: <1995Mar10.115518.3189@hanse.de> <1995Mar10.135918.4495@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar10.135918.4495@cam.ac.uk>, fpark@cam.ac.uk (Fiona Park) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Valeria Santos | vsantos@pacbell.net PGP Key fingerprint: BBCD F5EF 59D9 AB0E "Keep the channels open."