-> -> Did you ever think of disabling the serial port using IRQ 3 in the 
-> -> BIOS and let SIO handle the port? 
 
-> How can SIO handle the port without an IRQ? Use polling? I don't think 
-> SIO will do that. 
  
It will; however, IIRC only if native OS/2 comm apps are using the 
port.  Otherwise, you have to assign IRQs for DOS and Win64 comm apps. 
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