I/O Port Address List - Intel iSBC 86/14 Hardware Reference Manual

PROGRAMMING INFORMATION
Table 3-3. I/O Port Address List
I/O Port
Addresses Device Selected Function Performed
CO or C4
8259A PIC
Byte Read Status and Poll
Byte Write
ICWl, OCW2, OCW3
C2 or C4 8259A PIC Byte Read OCWl
Byte Write ICW2, ICW3, ICW4, OCWl
C8
8255A PPI
Read
Port A
Write Port A
CA
8255A PPI
Read
Port B
Write
Port B
CC
8255A PPI
Read
Port C
Write Port C
CE 8255A PPI
Read Control Word
Write
none
DO 8253-5 PIT Read
Counter 0
Write Counter
°
D2 8253-5 PIT
Read Counter 1
Write
Counter 1
D4 8253-5 PIT Read Counter 2
Write Counter 2
,
D6 8253-5 PIT Read
Control Word
Write
none
D8 or DC 825lA PCI Read Data
Write
Data
DA or DE 825lA PCI
Read Mode or command Word
Write
Status
CO, C2, C4,
or C6 Edge Interrupt
.
Sense Register Word Read None
Word Write
Clear Register
3-6