Path: utzoo!utgpu!cunews!bnrgate!brtph3!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request
From: was@gdwb.oz.au (Warren Stokes)
Newsgroups: comp.sys.sun
Subject: Hardware flow control under 4.1 and higher
Keywords: SunOS
Message-ID: <1233@brchh104.bnr.ca>
Date: 14 Jan 91 22:19:52 GMT
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Organization: Sun-Spots
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This subject relates to SPARCstation 1, 1+ and 2.

I would like to run my MNP5 modem efficiently.  This means running the tty
line at a higher speed than the link speed.  Obviously I need to have
hardware flow control.  I have noticed that under SunOS 4.1 and 4.1.1 when
I set crtscts, characters received are thrown away.  This presents no
problem with printers since when you are running crtscts you don`t expect
to receive any characters.

This can be demonstrated by using a D-connector with pin 4 linked to pin 5
and pin 2 linked to pin 3. With a an RS232 tester on the port and a remote
file entry like:


test:\
	dv=/dev/ttya:br#9600:hf:

I can tip to the port and see any characters typed go out (and back in)
but they don`t make it to the screen.  Take out the hf and it works fine.
I think it is a driver problem.

Has anyone else seen this problem?  Can anyone help me with a fix?

Thanks 
Warren Stokes
was@gdwb.OZ.AU