This unit was written by Patrick Hunlock, 10/19/1994

Copyright @ 1994 by Patrick Hunlock - all rights reserved

Software License Agreement: If you use this unit you are bound by
it's terms.

you may use this unit in your programs without royalties. if you use
this unit my name and the copyright notice must appear beneath your
name and copyright notice even if you have made significant
alterations to the source code in this unit.  this source code may
only be transmitted via the telephone system.
it may not be distributed on any magnetic, optical, or any future
computer media format without prior consent of the copyright
holder.  no charge may ever be levied for the receipt of this source
code other than normal phone charges and/or normal connect charges on
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would be considered normal access charges to download this source is
considered a sale of this source code which is expressly prohibited
by this license agreement.
you may distribute this source code via the telephone system (i.e.
bbs or computer network) in it's original form only, you may not add
or subtract to/from it in any way shape or form.

This ASYNC unit implements a COMPLETE multi-port serial interface
wrapped in a turbo pascal object.  Baud rates up to 110,000 are
supported.  Up to four ports may be opened at a time, up to two ports
may be active at any given time (four can be active so long as they
do not share interrupts).

Some considerations.  A com port which shares the same interrupt as
a serial mouse will over-ride the mouse driver for the duration of
the program.  If you have a mouse on Com1, avoid using Com3 in your
program.

Likewise if you have a mouse on Com2, avoid using Com4 in your
program. A mouse on a BUS card will not be affected by this unit.
Default addresses for the 4 com ports dictate that com1 & com3, and
com2 & com4 share an interrupt on the system bus.  As such while you
can open both ports, make sure that only - ONE of the ports on the
shared interrupt has been .ENABLED at any one time.
See the .ENABLE and .DISABLE procedures for more information.