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- Path: sparky!uunet!dtix!darwin.sura.net!convex!constellation!osuunx.ucc.okstate.edu!vms.ucc.okstate.edu!v923137
- From: v923137@vms.ucc.okstate.edu
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: dropped characters
- Message-ID: <1993Jan1.234936.1@vms.ucc.okstate.edu>
- Date: 2 Jan 93 05:49:36 GMT
- References: <1992Dec30.193133.3446@cid.aes.doe.CA>
- Sender: news@osuunx.ucc.okstate.edu (USENET News System)
- Organization: Oklahoma State University Computer Center
- Lines: 42
- Nntp-Posting-Host: vms.ucc.okstate.edu
-
- In article <1992Dec30.193133.3446@cid.aes.doe.CA>, ynecgan@cid.aes.doe.CA (Greg Neill) writes:
- >
- > Hello,
- > I am having some trouble with my communications software under
- > Windows. I have tried XTALK as well as the TERMINAL program that comes
- > with Windows, and both show symptoms of not being able to keep up with a
- > 9600 baud interface. The hardware platform is a '386DX at 33MHZ with an
- > internal Hayes 9600 baud modem.
- >
- > Typically if, say, a full page of output is being received, then
- > portions (whole lines) will be missing. Refreshing the page
- > (retransmitting it) sometimes works, but most often there are other
- > 'holes' left in the data. Looks suspiciously like a buffering problem.
- >
- > So what gives? Is it the software? Is Windows sucking so much CPU
- > that my machine can't handle 9600 baud transfers?
- >
- > Maybe someone can recommend a NON Windows communications package?
- >
-
- I have successfully used a 14,400 baud fax/modem under windows, while
- multi-tasking other semi-CPU intensive apps (Word 2.0, Lotus 4 win, XTGold).
- I have had no problems like the one you describe. I am using a 386-40 with
- 4MB RAM, and Windows 3.1. My comm program is PC-Plus for Windows. A friend
- of mine using the same exact setup with a different modem and different
- m/b manufacturer (still 386-40 though) cannot do this, he drops characters
- as you describe. The only explanation I can think of is that my modem uses
- the new 16550 UART chip and his has the older 16450 UART chip. You might
- check this on your modem (if it's internal). If it's a 16450, you are out
- of luck. However, if you have an external modem, you should be able
- to replace the UART chip on your I/O card with the 16550 for about $12.
- The 16450 only has a 1-byte buffer, whereas the 16550 has 8 or 10 byte buffer,
- I don't recall which, that seems to solve this problem. The only other
- thing I could think of is that the 33Mhz is somewhat slower than the 40Mhz that
- I use, so it could be bogging down more. 9600 baud is a substatial
- transfer rate, and it requires constant attention to catch all the characters,
- and/or a larger buffer than 1-byte (hardware buffer).
-
- I don't think that using a DOS-based comm program under Windows will help,
- it will probably actually hurt your chances of multi-tasking while downloading.
-
- -Jason Worley
-