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The Sio.sys driver is a replacement for the com.sys driver. The Sio.sys driver can support up to 16 COM ports.

DEVICE=\OS2\BOOT\SIO.SYS <parameters>
  • CN

The number of the Com port or the string COM1 to COMn. If you use a * in front of the Com port, then the port will be used as a PCMCIA Com port.

  • AN

A hexnumber to define the I/O address of the Com port.

  • IN

The IRQ number (0 to 15) or the string IRQ0 to IRQ15. If you don't use this parameter, SIO will search for a IRQ.

  • IG

This exists only for compatibility with COM.SYS and is ignored by Sio.sys.

Platform Support:

OS/2 2.x OS/2 3.0 OS/2 4.0 OS/2 4.5x
Yes Yes Yes Yes