From mcampbell@kth.se Fri Mar 01 18:52:28 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!mcampbell From: mcampbell@kth.se (Mikhail Campbell) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar01.185228.3226@kth.se> Date: Fri, 01 Mar 1996 18:52:28 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Mikhail Campbell US Robotics Courier V.34 @ 19,200 bps "The carrier frequency does not drift by accident." From csilva@earthlink.net Sun Mar 03 05:29:28 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!csilva From: csilva@earthlink.net (Camila Silva) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar03.052928.3481@earthlink.net> Date: Sun, 03 Mar 1996 05:29:28 GMT References: <1996Mar01.185228.3226@kth.se> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Mar01.185228.3226@kth.se>, mcampbell@kth.se (Mikhail Campbell) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Camila Silva Hayes Optima 288 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question." From mnakamura@pacbell.net Tue Mar 05 00:02:28 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!mnakamura From: mnakamura@pacbell.net (Mei Nakamura) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar05.000228.7157@pacbell.net> Date: Tue, 05 Mar 1996 00:02:28 GMT References: <1996Mar01.185228.3226@kth.se> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Mar01.185228.3226@kth.se>, mcampbell@kth.se (Mikhail Campbell) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Mei Nakamura === Dept of Electrical Engineering, Pacific Bell Internet Services "Measuring a record you own is listening, not piracy." From mpetrov@utexas.edu Wed Mar 06 04:18:28 1996 Path: ashpoly!cascade!bigsur!utexas!mpetrov From: mpetrov@utexas.edu (Mateo Petrov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar06.041828.9035@utexas.edu> Date: Wed, 06 Mar 1996 04:18:28 GMT References: <1996Mar01.185228.3226@kth.se> <1996Mar05.000228.7157@pacbell.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Mar05.000228.7157@pacbell.net>, mnakamura@pacbell.net (Mei Nakamura) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Mateo Petrov Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------