6. Appendix
User’s Manual
85
Table 6.1. I/O Port Addresses < 2 / 2 >
ADDRESS(hex) Description
Remark
CF0-CFF
Reserved for system
4000-4007 RAS
function
4008-400F
Reserved for system
4020-402F RTC
function
4030-403F
Reserved for system
46E8
Reserved for system
83D0-B3D3
Reserved for system
Interrupt Level List
Table 6.2. Hardware Interrupt Levels (Factory Settings)
Type 8259 Priority
Description
Vector
Remarks
NMI High
-I/O CH CK
02H
IRQ0 MASTER
↑
Timer
0
08H
IRQ1 "
⏐
Keyboard
09H
IRQ2 "
⏐
Interrupt controller 2 (slave)
0AH
IRQ8 SLAVE
⏐
Real-time
clock
70H
IRQ9 "
⏐
Reserved for PCI device
71H
IRQ10 "
⏐
Not
in
use
72H
Available to user
IRQ11 "
⏐
Not
in
use
73H
Available to user
IRQ12 "
⏐
Reserved for PS/2 mouse
74H
IRQ13 "
⏐
Reserved for coprocessor
75H
IRQ14 "
⏐
Reserved for hard disk
76H Primary
IRQ15 "
⏐
Reserved for CF card / optional CD-ROM
77H
Secondary
IRQ3 MASTER
⏐
Serial port B (COM2)
0BH
IRQ4 "
⏐
Serial port A (COM1)
0CH
IRQ5 "
⏐
Not
in
use
0DH
Available to user
IRQ6 "
↓
Reserved for floppy disk
0EH
IRQ7 " Low Not
in
use
0FH
Available to user
