From jschneider@mit.edu Sun Feb 18 10:17:01 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!jschneider From: jschneider@mit.edu (Jen Schneider) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb18.101701.3414@mit.edu> Date: Sun, 18 Feb 1996 10:17:01 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Jen Schneider *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From kmoreau@titech.ac.jp Mon Feb 19 13:35:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!titech!kmoreau From: kmoreau@titech.ac.jp (Kenji Moreau) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb19.133501.3930@titech.ac.jp> Date: Mon, 19 Feb 1996 13:35:01 GMT References: <1996Feb18.101701.3414@mit.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Feb18.101701.3414@mit.edu>, jschneider@mit.edu (Jen Schneider) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kenji Moreau "Extraordinary claims require extraordinary spectra." Amiga 3000T / NEXTSTEP 3.3 From tokonkwo@utexas.edu Wed Feb 21 02:48:01 1996 Path: ashpoly!cascade!bigsur!utexas!tokonkwo From: tokonkwo@utexas.edu (Tobias Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb21.024801.2037@utexas.edu> Date: Wed, 21 Feb 1996 02:48:01 GMT References: <1996Feb18.101701.3414@mit.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Feb18.101701.3414@mit.edu>, jschneider@mit.edu (Jen Schneider) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Tobias Okonkwo Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------