#: 17528 S12/OS9/68000 (OSK)
    14-Feb-93  19:06:53
Sb: #17498-Xon/off
Fm: Mark Griffith 76070,41
To: Bob van der Poel 76510,2203 (X)

Bob,

 > Can anyone shed some light on xon/off for me when it comes to device
 > descriptors. I'm confused about just how these things work.

Sure.  In Sterm, it doesn't matter what you have your hardware descriptor set
to.  Sterm nulls out the entire descriptor and manages everthing itself. As you
found, the only time it uses XON/XOFF is during a buffer capture, and that is
only necessary with the CoCos.

If you don't null out the descriptor, the driver will send an XOFF when the 
drivers internal buffer gets full, and an XON when some room is available.

Hardware handshaking is another thing altogether, but much like XON/XOFF. With
the high speed modems, there is need for some sort of handshaking between the
modem and the computer.  Since you don't want to use XON/XOFF as you already
noted, RTS/CTS handshaking is used instead.  In fact, the higher speed modems
require this to be used properly.

Hope this helps some.


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