From bpark@earthlink.net Mon May 27 12:00:34 1996 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!bpark From: bpark@earthlink.net (Bastien Park) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May27.120034.7093@earthlink.net> Date: Mon, 27 May 1996 12:00:34 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Bastien Park Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From kfischer@purdue.edu Tue May 28 20:23:34 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!kfischer From: kfischer@purdue.edu (Karen Fischer) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May28.202334.4628@purdue.edu> Date: Tue, 28 May 1996 20:23:34 GMT References: <1996May27.120034.7093@earthlink.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996May27.120034.7093@earthlink.net>, bpark@earthlink.net (Bastien Park) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Top-posters will be placed in my ~/.killfile without notice. -- Karen Fischer *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From jmartinez@inria.fr Thu May 30 13:17:34 1996 Path: ashpoly!cascade!brgate!saturno!inria!jmartinez From: jmartinez@inria.fr (Julien Martínez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May30.131734.7586@inria.fr> Date: Thu, 30 May 1996 13:17:34 GMT References: <1996May27.120034.7093@earthlink.net> <1996May28.202334.4628@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996May28.202334.4628@purdue.edu>, kfischer@purdue.edu (Karen Fischer) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- === Julien Martínez === Dept of Electrical Engineering, INRIA Rocquencourt "Row 14. No joke." From bokonkwo@pipeline.com Fri May 31 11:42:34 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!bokonkwo From: bokonkwo@pipeline.com (Bill Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May31.114234.1632@pipeline.com> Date: Fri, 31 May 1996 11:42:34 GMT References: <1996May27.120034.7093@earthlink.net> <1996May28.202334.4628@purdue.edu> <1996May30.131734.7586@inria.fr> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May30.131734.7586@inria.fr>, jmartinez@inria.fr (Julien Martínez) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Bill Okonkwo === Dept of Electrical Engineering, The Pipeline Internet Network "The hatch is open. Is anyone listening?"