)
Values for AMD-645 IRQ routing:
 0000	disabled
 0001	IRQ1
 0010	reserved
 0011	IRQ3
 ...
 0111	IRQ7
 1000	reserved
 1001	IRQ9
 ...
 1100	IRQ12
 1101	reserved
 1110	IRQ14
 1111	IRQ15
SeeAlso: #01025,#01027,#01028,#01029