Interrupt  0Bh  Communications Controller (serial port) hdw. entry
(0:002Ch)  (IRQ3)  Serial Port 2 (com2) 
note 1) IRQ 3 may be used by SDLC (synchronous data-link control) or  
	bisynchronous communications cards instead of a serial port. 
     2) The TOPS and PCnet adapters use this interrupt request line as an 
	alternate 
(internal) not present (80286 protected-mode)
	Generated when loading a segment register if the segment descriptor 
	indicates that the segment is not currently in memory. May be used to 
	implement virtual memory.