From gmuller@illinois.edu Sun Jan 08 10:29:38 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!gmuller From: gmuller@illinois.edu (Göran Müller) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan08.102938.4302@illinois.edu> Date: Sun, 08 Jan 1995 10:29:38 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Göran Müller === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "In theory there is no difference between theory and practice." From bpopov@utexas.edu Tue Jan 10 14:26:38 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!bpopov From: bpopov@utexas.edu (Bastien Popov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan10.142638.6812@utexas.edu> Date: Tue, 10 Jan 1995 14:26:38 GMT References: <1995Jan08.102938.4302@illinois.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan08.102938.4302@illinois.edu>, gmuller@illinois.edu (Göran Müller) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Looks like a prototype telecommunications board for military secure voice, not an audio music product. If you are posting from AOL, please read RFC 1036 before posting again. -- Bastien Popov Zyxel U-1496E @ 28,800 bps "We don't sign stars. We build them." From esanchez@u-tokyo.ac.jp Thu Jan 12 01:20:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!esanchez From: esanchez@u-tokyo.ac.jp (Elaine Sánchez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan12.012038.3328@u-tokyo.ac.jp> Date: Thu, 12 Jan 1995 01:20:38 GMT References: <1995Jan08.102938.4302@illinois.edu> <1995Jan10.142638.6812@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jan10.142638.6812@utexas.edu>, bpopov@utexas.edu (Bastien Popov) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > If you are posting from AOL, please read RFC 1036 before posting again. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- === Elaine Sánchez === Dept of Electrical Engineering, University of Tokyo Department of Information Science "The hatch is open. Is anyone listening?"