From alindqvist@mit.edu Wed Oct 23 08:59:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!alindqvist From: alindqvist@mit.edu (Astrid Lindqvist) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct23.085933.1806@mit.edu> Date: Wed, 23 Oct 1996 08:59:33 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. 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? -- === Astrid Lindqvist === Dept of Electrical Engineering, Massachusetts Institute of Technology "A soul is not exclusive to biology." From slarsson@hanse.de Thu Oct 24 02:55:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!slarsson From: slarsson@hanse.de (Sergei Larsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct24.025533.7298@hanse.de> Date: Thu, 24 Oct 1996 02:55:33 GMT References: <1996Oct23.085933.1806@mit.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Oct23.085933.1806@mit.edu>, alindqvist@mit.edu (Astrid Lindqvist) 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. -- Sergei Larsson | slarsson@hanse.de PGP Key fingerprint: 80B4 78CC 0026 46ED "Keep the channels open." From dokonkwo@unam.mx Thu Oct 24 23:31:33 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!dokonkwo From: dokonkwo@unam.mx (Dmitri Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct24.233133.9961@unam.mx> Date: Thu, 24 Oct 1996 23:31:33 GMT References: <1996Oct23.085933.1806@mit.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct23.085933.1806@mit.edu>, alindqvist@mit.edu (Astrid Lindqvist) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Dmitri Okonkwo *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From afournier@stanford.edu Fri Oct 25 09:01:33 1996 Path: ashpoly!cascade!brgate!saturno!stanford!afournier From: afournier@stanford.edu (Anja Fournier) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct25.090133.6026@stanford.edu> Date: Fri, 25 Oct 1996 09:01:33 GMT References: <1996Oct23.085933.1806@mit.edu> <1996Oct24.025533.7298@hanse.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Oct24.025533.7298@hanse.de>, slarsson@hanse.de (Sergei Larsson) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Anja Fournier Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------