From bkuznetsov@inria.fr Fri Dec 13 14:01:10 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!bkuznetsov From: bkuznetsov@inria.fr (Bastien Kuznetsov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec13.140110.1882@inria.fr> Date: Fri, 13 Dec 1996 14:01:10 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr 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. 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? -- Bastien Kuznetsov *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From jschneider@titech.ac.jp Sat Dec 14 09:53:10 1996 Path: ashpoly!cascade!transat!ukc!fennimore!titech!jschneider From: jschneider@titech.ac.jp (Jens Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec14.095310.5065@titech.ac.jp> Date: Sat, 14 Dec 1996 09:53:10 GMT References: <1996Dec13.140110.1882@inria.fr> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec13.140110.1882@inria.fr>, bkuznetsov@inria.fr (Bastien Kuznetsov) 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. -- Jens Schneider Zyxel U-1496E @ 9600 Telebit bps "Measuring a record you own is listening, not piracy." From lhernandez@demon.co.uk Mon Dec 16 08:01:10 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!lhernandez From: lhernandez@demon.co.uk (Lucia Hernández) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec16.080110.8564@demon.co.uk> Date: Mon, 16 Dec 1996 08:01:10 GMT References: <1996Dec13.140110.1882@inria.fr> <1996Dec14.095310.5065@titech.ac.jp> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec14.095310.5065@titech.ac.jp>, jschneider@titech.ac.jp (Jens Schneider) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Lucia Hernández *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From ldubois@inria.fr Mon Dec 16 11:07:10 1996 Path: ashpoly!cascade!brgate!saturno!inria!ldubois From: ldubois@inria.fr (Lars Dubois) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec16.110710.4074@inria.fr> Date: Mon, 16 Dec 1996 11:07:10 GMT References: <1996Dec13.140110.1882@inria.fr> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Dec13.140110.1882@inria.fr>, bkuznetsov@inria.fr (Bastien Kuznetsov) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Lars Dubois US Robotics Courier V.34 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From dfischer@unam.mx Tue Dec 17 08:31:10 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!dfischer From: dfischer@unam.mx (Diego Fischer) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec17.083110.4716@unam.mx> Date: Tue, 17 Dec 1996 08:31:10 GMT References: <1996Dec13.140110.1882@inria.fr> <1996Dec14.095310.5065@titech.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Dec14.095310.5065@titech.ac.jp>, jschneider@titech.ac.jp (Jens Schneider) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Diego Fischer Tape trading list upon request. SASE required for international mail.