From hnovak@cmu.edu Wed Dec 07 13:30:52 1994 Path: ashpoly!cascade!mxgate!coyoacan!cmu!hnovak From: hnovak@cmu.edu (Heather Novak) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec07.133052.2932@cmu.edu> Date: Wed, 07 Dec 1994 13:30:52 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- === Heather Novak === Dept of Electrical Engineering, Carnegie Mellon University School of CS "5 sigma is a discovery. 7 is a question." From keriksson@earthlink.net Fri Dec 09 06:13:52 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!keriksson From: keriksson@earthlink.net (Katrin Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec09.061352.1442@earthlink.net> Date: Fri, 09 Dec 1994 06:13:52 GMT References: <1994Dec07.133052.2932@cmu.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Dec07.133052.2932@cmu.edu>, hnovak@cmu.edu (Heather Novak) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Katrin Eriksson Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From lvasiliev@uni-hamburg.de Sun Dec 11 09:33:52 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!lvasiliev From: lvasiliev@uni-hamburg.de (Lucia Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec11.093352.8763@uni-hamburg.de> Date: Sun, 11 Dec 1994 09:33:52 GMT References: <1994Dec07.133052.2932@cmu.edu> <1994Dec09.061352.1442@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Dec09.061352.1442@earthlink.net>, keriksson@earthlink.net (Katrin Eriksson) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Lucia Vasiliev Hayes Optima 288 @ 28,800 bps "Row 14. No joke." From fmartinez@mindspring.com Sun Dec 11 12:16:52 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!fmartinez From: fmartinez@mindspring.com (Freya Martínez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec11.121652.3380@mindspring.com> Date: Sun, 11 Dec 1994 12:16:52 GMT References: <1994Dec07.133052.2932@cmu.edu> <1994Dec09.061352.1442@earthlink.net> <1994Dec11.093352.8763@uni-hamburg.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec11.093352.8763@uni-hamburg.de>, lvasiliev@uni-hamburg.de (Lucia Vasiliev) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Freya Martínez Zyxel U-1496E @ 19,200 bps "The hatch is open. Is anyone listening?"