OZCIS.COM is a program intended to provide support for serial ports utilizing
non-standard IRQ's.  OZCIS.COM sets up a temporary interrupt service routine
that redirects the non-standard IRQ to the expected IRQ, and then executes
OZCIS.EXE.  When OZCIS.EXE terminates, the temporary interrupt service
routine is removed and OZCIS.COM terminates.  Operation is totally
transparent since DOS loads a .COM file in preference to a .EXE file when
both are present.

Standard IRQ assignments are:

     COM1   :   IRQ4
     COM2   :   IRQ3
     COM3   :   IRQ4
     COM4   :   IRQ3

The OZCIS.COM in this archive is configured to redirect IRQ5 to IRQ4. 
Therefore, the expected serial port is COM1 or COM3.  Other configurations
are possible by patching two bytes in OZCIS.COM:

Offset   Value   Description

 0000     E9h    \
 0001     E8h     >   *** DO NOT CHANGE ***
 0002     00h    /
 0003     05h         Source IRQ (IRQ your port uses)
 0004     04h         Destination IRQ (4 = COM1/COM3   3 = COM2/COM4)

Questions or comments may be directed to Ronald E. Raikes, 73170,134.