From agirard@hanse.de Wed Oct 26 13:02:32 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!agirard From: agirard@hanse.de (Amy Girard) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct26.130232.1944@hanse.de> Date: Wed, 26 Oct 1994 13:02:32 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. 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? -- Amy Girard Hayes Optima 288 @ ISDN 64k bps "In theory there is no difference between theory and practice." From nreyes@pacbell.net Fri Oct 28 15:20:32 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!nreyes From: nreyes@pacbell.net (Nadia Reyes) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct28.152032.2671@pacbell.net> Date: Fri, 28 Oct 1994 15:20:32 GMT References: <1994Oct26.130232.1944@hanse.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Oct26.130232.1944@hanse.de>, agirard@hanse.de (Amy Girard) 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. PGP Public key available via finger or upon request. -- Nadia Reyes *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From brodriguez@illinois.edu Sat Oct 29 00:44:32 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!brodriguez From: brodriguez@illinois.edu (Bastien Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct29.004432.9041@illinois.edu> Date: Sat, 29 Oct 1994 00:44:32 GMT References: <1994Oct26.130232.1944@hanse.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct26.130232.1944@hanse.de>, agirard@hanse.de (Amy Girard) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Bastien Rodríguez -- University of Illinois Urbana-Champaign "A soul is not exclusive to biology." From mdubois@kth.se Sat Oct 29 17:36:32 1994 Path: ashpoly!cascade!mxgate!coyoacan!kth!mdubois From: mdubois@kth.se (Mei Dubois) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct29.173632.5201@kth.se> Date: Sat, 29 Oct 1994 17:36:32 GMT References: <1994Oct26.130232.1944@hanse.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Oct26.130232.1944@hanse.de>, agirard@hanse.de (Amy Girard) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Mei Dubois "Hold for relay." 486DX2/66 (Linux 1.2.13) / System 7.5.1 From tcampbell@utexas.edu Sat Oct 29 18:28:32 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!tcampbell From: tcampbell@utexas.edu (Tyler Campbell) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct29.182832.3193@utexas.edu> Date: Sat, 29 Oct 1994 18:28:32 GMT References: <1994Oct26.130232.1944@hanse.de> <1994Oct28.152032.2671@pacbell.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Oct28.152032.2671@pacbell.net>, nreyes@pacbell.net (Nadia Reyes) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. > PGP Public key available via finger or upon request. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Tyler Campbell Practical Peripherals 14.4 @ 14,400 bps "Hold for relay."