Int 0B  - IRQ3 - Serial Communications (com2)                              [H]

Desc:  automatically asserted by the UART when COM2 needs attention, if the
     UART has been programmed to generate interrupts

Notes: the TOPS and PCnet adapters use this interrupt request line as an
     alternate
   on PS/2s, COM2 through COM8 share this interrupt; on many PC's, COM4
     shares this interrupt
   may be masked by setting bit 3 on I/O port 21h

See Also: INT 0C"COM1",INT 53"DESQview",INT 5B"DoubleDOS",INT 7B"GO32"