From: utzoo!decvax!harpo!seismo!rlgvax!guy
Newsgroups: net.unix-wizards
Title: Re: TANDEM mode on tty lines
Article-I.D.: rlgvax.205
Posted: Fri Apr  8 23:57:43 1983
Received: Sun Apr 10 01:02:19 1983
References: sri-arpa.826

The way the System III driver handles it (it's been renamed IXOFF, but it's
the same thing) is to set a flag in the driver saying "send out an XOFF"
or "send out an XON".  If an "output complete" interrupt occurs from the device
(at the end of the current character for non-DMA devices or at the end of the
current block of characters), before it starts transmitting the next character
or block it spits out the XON or XOFF.  This way, it transmits the XOFF/XON
as soon as possible.

					Guy Harris
					RLG Corporation
					{seismo,mcnc,we13}!rlgvax!guy