From meriksson@u-tokyo.ac.jp Fri Feb 11 08:27:42 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!meriksson From: meriksson@u-tokyo.ac.jp (Mateo Eriksson) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb11.082742.9161@u-tokyo.ac.jp> Date: Fri, 11 Feb 1994 08:27:42 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Mateo Eriksson *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From akuznetsov@u-tokyo.ac.jp Sat Feb 12 15:08:42 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!akuznetsov From: akuznetsov@u-tokyo.ac.jp (Aiko Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb12.150842.4206@u-tokyo.ac.jp> Date: Sat, 12 Feb 1994 15:08:42 GMT References: <1994Feb11.082742.9161@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb11.082742.9161@u-tokyo.ac.jp>, meriksson@u-tokyo.ac.jp (Mateo Eriksson) 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. -- Aiko Kuznetsov Tape trading list upon request. SASE required for international mail. From sschneider@clari.net Sat Feb 12 19:44:42 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!sschneider From: sschneider@clari.net (Sergei Schneider) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb12.194442.6260@clari.net> Date: Sat, 12 Feb 1994 19:44:42 GMT References: <1994Feb11.082742.9161@u-tokyo.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Feb11.082742.9161@u-tokyo.ac.jp>, meriksson@u-tokyo.ac.jp (Mateo Eriksson) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Sergei Schneider US Robotics Courier V.34 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question."