PXB-721 IO card Settings and Configuration

Card Type	I/O controller
Chipset/Controller	Intel
I/O Options	8255 I/O ports (3)
Maximum DRAM	N/A

CONNECTIONS
Purpose	Location	Purpose	Location
34-pin 8255 interface 1	H1	34-pin 8255 interface 3	H3
34-pin 8255 interface 2	H2

BASE MEMORY ADDRESS SELECT
Address	SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6
230h	Off	On	On	On	Off	Off
260h	Off	On	On	Off	Off	On
2E0h	Off	On	Off	Off	Off	On
300h	Off	Off	On	On	On	On
350h	Off	Off	On	Off	On	Off

EXTERNAL INTERRUPT EDGE
Edge	J1
Rising	Pins 1 & 3 closed
Falling	Pins 1 & 2 closed

INTERRUPT SELECT
IRQ	J5/A	J5/B	J5/C	J5/D	J5/E	J5/F
IR/FONT>	Open	Open	Open	Open	Open	Closed
IRQ3	Open	Open	Open	Open	Closed	Open
IRQ4	Open	Open	Open	Closed	Open	Open
IRQ5	Open	Open	Closed	Open	Open	Open
IRQ6	Open	Closed	Open	Open	Open	Open
IRQ7	Closed	Open	Open	Open	Open	Open

PORT 1 INTERRUPT SELECT
IRQ	J2
A	Pins 2 & 3, 4 & 5 closed
B	Pins 1 & 2, 5 & 6 closed

PORT 2 INTERRUPT SELECT
IRQ	J3
A	Pins 2 & 3, 4 & 5 closed
B	Pins 1 & 2, 5 & 6 closed

PORT 3 INTERRUPT SELECT
IRQ	J4
A	Pins 2 & 3, 4 & 5 closed
B	Pins 1 & 2, 5 & 6 closed