From tmuller@unam.mx Fri Oct 25 05:29:35 1996 Path: ashpoly!cascade!brgate!saturno!unam!tmuller From: tmuller@unam.mx (Tyler Müller) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct25.052935.3232@unam.mx> Date: Fri, 25 Oct 1996 05:29:35 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Tyler Müller "The carrier frequency does not drift by accident." Macintosh IIfx / AmigaOS 3.1 From adubois@earthlink.net Fri Oct 25 11:08:35 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!adubois From: adubois@earthlink.net (Anja Dubois) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct25.110835.3693@earthlink.net> Date: Fri, 25 Oct 1996 11:08:35 GMT References: <1996Oct25.052935.3232@unam.mx> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Oct25.052935.3232@unam.mx>, tmuller@unam.mx (Tyler Müller) 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'. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Anja Dubois *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From tperez@kiae.su Sun Oct 27 00:25:35 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!tperez From: tperez@kiae.su (Takeshi Pérez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct27.002535.5451@kiae.su> Date: Sun, 27 Oct 1996 00:25:35 GMT References: <1996Oct25.052935.3232@unam.mx> <1996Oct25.110835.3693@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Oct25.110835.3693@earthlink.net>, adubois@earthlink.net (Anja Dubois) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Takeshi Pérez Tape trading list upon request. SASE required for international mail. From mstewart@berkeley.edu Sun Oct 27 09:06:35 1996 Path: ashpoly!cascade!brgate!saturno!berkeley!mstewart From: mstewart@berkeley.edu (Marta Stewart) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct27.090635.3387@berkeley.edu> Date: Sun, 27 Oct 1996 09:06:35 GMT References: <1996Oct25.052935.3232@unam.mx> <1996Oct25.110835.3693@earthlink.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct25.110835.3693@earthlink.net>, adubois@earthlink.net (Anja Dubois) 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. -- Marta Stewart Hayes Optima 288 @ ISDN 64k bps "We don't sign stars. We build them." From jlee@illinois.edu Sun Oct 27 23:15:35 1996 Path: ashpoly!cascade!brgate!saturno!illinois!jlee From: jlee@illinois.edu (Joachim Lee) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct27.231535.4498@illinois.edu> Date: Sun, 27 Oct 1996 23:15:35 GMT References: <1996Oct25.052935.3232@unam.mx> <1996Oct25.110835.3693@earthlink.net> <1996Oct27.090635.3387@berkeley.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Oct27.090635.3387@berkeley.edu>, mstewart@berkeley.edu (Marta Stewart) 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. -- Joachim Lee Tape trading list upon request. SASE required for international mail.