IBM 6151 Maintenance And Service Manual page 660

Switch Settings
Use the drawing on the next page to locate the switch banks; then
set the interrupt level and the address switches as shown.
Switch Bank 1 - Interrupt Level Selection
11
Off On
Switch 1 X
Switch 2 X
Switch 3 X
Switch Bank 2 - Address Range Selection
4
Off On
Switch 1 X
Switch 2
X
Switch 3 X
Switch 4 X
Switch 5 X
Switch 6 X
Switch 7 X
Switch 8
X
9-092-2 Service Manual