From jsilva@kiae.su Tue Jun 11 04:13:55 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!jsilva From: jsilva@kiae.su (Julien Silva) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun11.041355.6535@kiae.su> Date: Tue, 11 Jun 1996 04:13:55 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Julien Silva -- Kurchatov Institute of Atomic Energy, Moscow "Row 14. No joke." From aeriksson@utexas.edu Tue Jun 11 12:51:55 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!aeriksson From: aeriksson@utexas.edu (Astrid Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun11.125155.3790@utexas.edu> Date: Tue, 11 Jun 1996 12:51:55 GMT References: <1996Jun11.041355.6535@kiae.su> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Jun11.041355.6535@kiae.su>, jsilva@kiae.su (Julien Silva) 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. -- Astrid Eriksson Tape trading list upon request. SASE required for international mail. From yvasiliev@earthlink.net Wed Jun 12 17:07:55 1996 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!yvasiliev From: yvasiliev@earthlink.net (Yuki Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun12.170755.9151@earthlink.net> Date: Wed, 12 Jun 1996 17:07:55 GMT References: <1996Jun11.041355.6535@kiae.su> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun11.041355.6535@kiae.su>, jsilva@kiae.su (Julien Silva) 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. -- Yuki Vasiliev -- EarthLink Network "Extraordinary claims require extraordinary spectra." From eoliveira@uni-hamburg.de Fri Jun 14 05:55:55 1996 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!eoliveira From: eoliveira@uni-hamburg.de (Elaine Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun14.055555.6699@uni-hamburg.de> Date: Fri, 14 Jun 1996 05:55:55 GMT References: <1996Jun11.041355.6535@kiae.su> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jun11.041355.6535@kiae.su>, jsilva@kiae.su (Julien Silva) 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. -- === Elaine Oliveira === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "Measuring a record you own is listening, not piracy." From mhughes@illinois.edu Sun Jun 16 09:28:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!mhughes From: mhughes@illinois.edu (Mei Hughes) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun16.092855.9889@illinois.edu> Date: Sun, 16 Jun 1996 09:28:55 GMT References: <1996Jun11.041355.6535@kiae.su> <1996Jun12.170755.9151@earthlink.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jun12.170755.9151@earthlink.net>, yvasiliev@earthlink.net (Yuki Vasiliev) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Mei Hughes US Robotics Courier V.34 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question."