Serial Port Delay

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#59579

From: Peter Horan
Date: Tue, 16 Jan 1996 00:00

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Has anyone else dealt with a similar problem? 

When I do
cat >/dev/cua1
and watch the modem lights or an RS232 monitor without the modem and
with or without a loopback plug, I get a peculiar delay, as follows:
a		# No delay
aa		# ditto
aaa		# ditto
aaaa		# ditto
aaaaa		# five second delay

Similarly when I use dip, slip, rlogin, ftp, a similar delay occurs.

The system is typical - 386/387, 16 Mb, 350Mb + 540Mb ide hard drives, 5
1/4 and 3 1/2 floppies, two serial ports (8250 mouse, 16450 /dev/cua1),
parallel port, sound blaster pro, cdrom - 562J

Interrrupts reported 3, 4 serial ports, 5 sbpro, 14 ide, 13 fpu, which
is what I thought they were.

Kernel configured for the above - slakware Linux 1.2.1. Distributed
kernel shows the same problem.

I have not yet investigated interrupt conflicts by removing hardware.


-- 
Peter Horan                     School of Computing and Mathematics
peter@deakin.edu.au             Deakin University
+61-52-27 1234 (Voice)          Geelong, Victoria 3217
+61-52-27 2028 (FAX)            Australia
http://www.cm.deakin.edu.au/~peter

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Subject: Serial Port Delay
Date: 1996/01/16
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