2-18
Owner's Handbook
2.7.2
I/O Address Map
Table 2-5
System I/O Address Map
Address
Range (hex)
Device
000 ~ 01F
DMA Controller-1, 8273
020 ~ 027
Interrupt Controller-1, 8259
030 ~ 037
Interrupt Controller-1, 8259
040 ~ 047
System Timer (8254-1)
050 ~ 057
System Timer (8254-1)
060 ~ 06F
Keyboard Controller 8742
070 ~ 07F
Real-Time Clock, NMI Mask
080 ~ 09F
DMA Page Register 74LS612
Speed Status Register
0A0 ~ 0BF
Interrupt Controller-2, 8259
0C0 ~ 0DF
DMA Controller-2, 8237
0F0
Clear Math Coprocessor BUSY
0F1
Reset Coprocessor
0F8 ~ 0FF
Math Coprocessor
*
800 ~ 8FF
NV RAM Address