Interrupt Controller (8259A)
Jumper Selections
Interrupt Level
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
W5 IRO
W4 IR1
W6 IR2
W7 IR3
W8 IR4
W2, W9 IR5
W3, W10 IR6
W11 IR7
8087 Interrupt
Timer 0
INTRQ1*
FP1*
INTRQ*
Timer 2
FP3*
COM2*
Timer 1
COM1*
Power Fail*
FP5*
FP6*
INTRQ2*
LPT1
FP7*
Figure 12–5. 8259A Interrupts.
12-23
