Bitfields for Intel 82371MX serial and parallel port enable register:
Bit(s)	Description	)
 7	reserved
 6	LPT3 enabled
 5	LPT2 enabled
 4	LPT1 enabled
 3	COM4 enabled
 2	COM3 enabled
 1	COM2 enabled
 0	COM1 enabled
SeeAlso: #01168,PORT xxxxh"Intel 82371"