In a message dated 01-20-14, Robert Wolfe said to John Kelly:

RW> 
-> How can SIO handle the port without an IRQ? Use polling? I don't think 
-> SIO will do that. 
RW>  
RW>It will; however, IIRC only if native OS/2 comm apps are using the 
RW>port.  Otherwise, you have to assign IRQs for DOS and Win64 comm
RW>apps.

As long as you use the DOS built into OS/2 you don't need to assign an
IRQ for serial comms.

Have a nice day,

Holger

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