From jtakahashi@clari.net Thu Jul 21 22:08:48 1994 Path: ashpoly!cascade!transat!ukc!fennimore!clari!jtakahashi From: jtakahashi@clari.net (Ji-woo Takahashi) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul21.220848.3127@clari.net> Date: Thu, 21 Jul 1994 22:08:48 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 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? -- Ji-woo Takahashi *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From ewatanabe@mit.edu Fri Jul 22 01:40:48 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!ewatanabe From: ewatanabe@mit.edu (Emi Watanabe) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul22.014048.2163@mit.edu> Date: Fri, 22 Jul 1994 01:40:48 GMT References: <1994Jul21.220848.3127@clari.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jul21.220848.3127@clari.net>, jtakahashi@clari.net (Ji-woo Takahashi) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Emi Watanabe *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From jfischer@inria.fr Fri Jul 22 15:30:48 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!jfischer From: jfischer@inria.fr (Jens Fischer) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul22.153048.3916@inria.fr> Date: Fri, 22 Jul 1994 15:30:48 GMT References: <1994Jul21.220848.3127@clari.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Jul21.220848.3127@clari.net>, jtakahashi@clari.net (Ji-woo Takahashi) writes: > 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Top-posters will be placed in my ~/.killfile without notice. -- Jens Fischer US Robotics Courier V.34 @ 9600 Telebit bps "A soul is not exclusive to biology." From tkowalski@kiae.su Fri Jul 22 16:40:48 1994 Path: ashpoly!cascade!bigsur!kiae!tkowalski From: tkowalski@kiae.su (Tomas Kowalski) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul22.164048.6921@kiae.su> Date: Fri, 22 Jul 1994 16:40:48 GMT References: <1994Jul21.220848.3127@clari.net> <1994Jul22.014048.2163@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jul22.014048.2163@mit.edu>, ewatanabe@mit.edu (Emi Watanabe) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Tomas Kowalski Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------