From lnakamura@earthlink.net Mon Nov 20 04:03:49 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!lnakamura From: lnakamura@earthlink.net (Lars Nakamura) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov20.040349.4043@earthlink.net> Date: Mon, 20 Nov 1995 04:03:49 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. 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. -- Lars Nakamura Tape trading list upon request. SASE required for international mail. From mtanaka@stanford.edu Mon Nov 20 21:25:49 1995 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!mtanaka From: mtanaka@stanford.edu (Marta Tanaka) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov20.212549.3474@stanford.edu> Date: Mon, 20 Nov 1995 21:25:49 GMT References: <1995Nov20.040349.4043@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Nov20.040349.4043@earthlink.net>, lnakamura@earthlink.net (Lars Nakamura) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Marta Tanaka === Dept of Electrical Engineering, Stanford University Computer Systems Lab "Hardware is temporary. The signal survives." From pivanov@uni-hamburg.de Tue Nov 21 06:34:49 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!pivanov From: pivanov@uni-hamburg.de (Pavel Ivanov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov21.063449.4107@uni-hamburg.de> Date: Tue, 21 Nov 1995 06:34:49 GMT References: <1995Nov20.040349.4043@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Nov20.040349.4043@earthlink.net>, lnakamura@earthlink.net (Lars Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Pavel Ivanov "There are 14 nodes and only 10 countries. Count again." Amiga 1200 (Blizzard 030/50) / Linux 1.2.13 From dsuzuki@kth.se Wed Nov 22 00:57:49 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!dsuzuki From: dsuzuki@kth.se (Dave Suzuki) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov22.005749.4679@kth.se> Date: Wed, 22 Nov 1995 00:57:49 GMT References: <1995Nov20.040349.4043@earthlink.net> <1995Nov20.212549.3474@stanford.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov20.212549.3474@stanford.edu>, mtanaka@stanford.edu (Marta Tanaka) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Dave Suzuki *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From koliveira@ox.ac.uk Wed Nov 22 19:43:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!koliveira From: koliveira@ox.ac.uk (Kirsty Oliveira) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov22.194349.9333@ox.ac.uk> Date: Wed, 22 Nov 1995 19:43:49 GMT References: <1995Nov20.040349.4043@earthlink.net> <1995Nov20.212549.3474@stanford.edu> <1995Nov22.005749.4679@kth.se> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov22.005749.4679@kth.se>, dsuzuki@kth.se (Dave Suzuki) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kirsty Oliveira *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0