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Posting-Version: version B 2.10.2 9/5/84; site othervax.UUCP
Path: utzoo!linus!philabs!micomvax!othervax!ray
From: ray@othervax.UUCP (Raymond D. Dunn)
Newsgroups: net.micro.pc
Subject: CROSSTALK @ 9600baud. Beware!
Message-ID: <697@othervax.UUCP>
Date: Wed, 18-Sep-85 09:34:12 EDT
Article-I.D.: othervax.697
Posted: Wed Sep 18 09:34:12 1985
Date-Received: Sat, 21-Sep-85 11:26:41 EDT
Reply-To: ray@othervax.UUCP (Raymond D. Dunn)
Followup-To: net.micro.pc
Organization: Philips Information Systems - St. Laurent  P.Q., Canada
Lines: 17
Keywords: CROSSTALK,data loss
Summary: CROSSTALK loses data @ 9600 baud

References:

Due to occasional loss of data using XTALK at 9600baud over
standard serial ports, in terminal mode, with Capture on or
off, an investigation has revealed:

 1. When updating the screen status line (done in XTALK's
    timer interrupt), XTALK keeps interrupts inhibited for
    periods exceeding 1Msec.

 2. XTALK does NOT check for overrun or other errors
    on the port, thus data loss/parity errors are IGNORED.

The fault can be demonstrated easily by having the online timer
running during data receipt.

Beware!

Ray Dunn.  ..philabs!micomvax!othervax