INT 0B - IRQ3 - SERIAL COMMUNICATIONS (COM2)
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
SeeAlso: INT 0C"COM1",INT 53"DESQview",INT 5B"DoubleDOS",INT 7B"GO32"

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