Return to BSD News archive
Xref: sserve comp.os.linux.misc:29666 comp.os.386bsd.questions:14432 sci.electronics:84050 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!agate!darkstar.UCSC.EDU!news.hal.COM!olivea!cnn.spk.olivetti.com!tau-ceti!jupiter!opus-ovh!bmork From: bmork@opus-ovh.spk.wa.us (Brian Mork) Newsgroups: comp.os.linux.misc,comp.os.386bsd.questions,sci.electronics Subject: Re: 16550 detection Message-ID: <941112.002449.1p9.rusnews.w165w@opus-ovh.spk.wa.us> Date: Sat, 12 Nov 1994 00:24:49 GMT References: <jonkCypCzF.Jrq@netcom.com> <Cytt4L.DLo@bonkers.taronga.com> <jonkCz2KK2.L04@netcom.com> Organization: Lutron - Pacific Northwest X-Newsreader: rusnews v1.05 Lines: 39 jonk@netcom.com (Jonathan Dale Kirwan) writes: > externals carry their own problems, though, most notably that you must > then ship the bytes through a small buffer (16 chars in the 16550) at best. > This can really make a Windows solution very difficult! > I like externals, but again, the data rates are achieving staggering > burst levels these days. Many folks are using their modems with Windows > software exclusively and I have yet to find an external provided with > Windows drivers up to the job. They fail with overruns far too often. > (If you are able to sustain high data rates with > such an external configuration under Windows with several applications > I'd sure appreciate hearing the story.) I seem to have assembled a system capable of sustaining high data rates with an external, multi-tasking under Windows. I have an Internet leaf site, with user dial-in capability, and an Amateur Radio network link over 145 MHz that run always in the background of Windows 3.1 on top of MSDOS 5.0 (well, actually NortonDOS 6.1, but that shouldn't matter). I do word processing, email processing, or other computer dinking in the foreground (like now). The hardware platform is a 33 MHz '486, and the CPU is clock doubled to 66 MHz. The Internet data passing is done with UUCICO through an external 14.4K modem, with the computer to modem link locked at 57600 bits per second. I use the BNU FOSSIL talking through a 16450 UART. Even running in the background, I get throughput (not burst rates, but bytes/wall-clock time) on the average of 1800 cps and peaks above 3000 cps. That's 30,000 bits per second sustained over a 2-4 minute period, 52% of the theoretical peak limit of a fully V.42 compressed (4x) data file. I'm happy :) -- Brian J. Mork. Voice (509) 244-3764 Data (509) 244-9260 UUCP bmork@opus-ovh.spk.wa.us / ARO ka9snf@ka7fvv.#ewa.wa.usa USMail 6006-B Eaker, Fairchild, WA 99011