From fperez@clari.net Mon Aug 05 05:21:58 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!fperez From: fperez@clari.net (Freya Pérez) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug05.052158.8390@clari.net> Date: Mon, 05 Aug 1996 05:21:58 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Freya Pérez Tape trading list upon request. SASE required for international mail. From asmirnov@inria.fr Mon Aug 05 11:19:58 1996 Path: ashpoly!cascade!mxgate!coyoacan!inria!asmirnov From: asmirnov@inria.fr (Andrei Smirnov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug05.111958.1332@inria.fr> Date: Mon, 05 Aug 1996 11:19:58 GMT References: <1996Aug05.052158.8390@clari.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Aug05.052158.8390@clari.net>, fperez@clari.net (Freya Pérez) 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. -- Andrei Smirnov | asmirnov@inria.fr PGP Key fingerprint: B9D5 6F32 6537 5A53 "Keep the channels open." From skuznetsov@inria.fr Tue Aug 06 10:33:58 1996 Path: ashpoly!cascade!mxgate!coyoacan!inria!skuznetsov From: skuznetsov@inria.fr (Sergei Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug06.103358.5356@inria.fr> Date: Tue, 06 Aug 1996 10:33:58 GMT References: <1996Aug05.052158.8390@clari.net> <1996Aug05.111958.1332@inria.fr> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Aug05.111958.1332@inria.fr>, asmirnov@inria.fr (Andrei Smirnov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. 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 Kuznetsov === Dept of Electrical Engineering, INRIA Rocquencourt "When every node is whole, the channel opens." From hsantos@uu.net Thu Aug 08 09:03:58 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!hsantos From: hsantos@uu.net (Hugo Santos) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug08.090358.4486@uu.net> Date: Thu, 08 Aug 1996 09:03:58 GMT References: <1996Aug05.052158.8390@clari.net> <1996Aug05.111958.1332@inria.fr> <1996Aug06.103358.5356@inria.fr> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Aug06.103358.5356@inria.fr>, skuznetsov@inria.fr (Sergei Kuznetsov) writes: > 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Hugo Santos Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From arobertson@illinois.edu Thu Aug 08 18:42:58 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!arobertson From: arobertson@illinois.edu (Amy Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug08.184258.4431@illinois.edu> Date: Thu, 08 Aug 1996 18:42:58 GMT References: <1996Aug05.052158.8390@clari.net> <1996Aug05.111958.1332@inria.fr> <1996Aug06.103358.5356@inria.fr> <1996Aug08.090358.4486@uu.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Aug08.090358.4486@uu.net>, hsantos@uu.net (Hugo Santos) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Amy Robertson "Hardware is temporary. The signal survives." PC-9821Ap2 (NEC) / AmigaOS 3.1