From jjohansson@mindspring.com Fri Aug 05 14:38:57 1994 Path: ashpoly!cascade!bigsur!mindspring!jjohansson From: jjohansson@mindspring.com (Jen Johansson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug05.143857.2685@mindspring.com> Date: Fri, 05 Aug 1994 14:38:57 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Jen Johansson *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From bandersson@illinois.edu Sat Aug 06 15:03:57 1994 Path: ashpoly!cascade!brgate!saturno!illinois!bandersson From: bandersson@illinois.edu (Brian Andersson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug06.150357.9212@illinois.edu> Date: Sat, 06 Aug 1994 15:03:57 GMT References: <1994Aug05.143857.2685@mindspring.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Aug05.143857.2685@mindspring.com>, jjohansson@mindspring.com (Jen Johansson) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Brian Andersson | bandersson@illinois.edu PGP Key fingerprint: 2FE9 7279 BF8F B13D "Keep the channels open."