Bitfields for Intel 82371MX Event Enable 4 register:
Bit(s)	Description	)
 7	Enable PMAC1
 6	Enable PMAC0
 5	Enable PAC5
 4	Enable PAC4
 3	Enable PAC3
 2	Enable PAC2
 1	Enable PAC1
 0	Enable PCSC
SeeAlso: #01168,PORT xxxxh"Intel 82371"