586OP
I/O Address Map
I/O Address
Function
000-01F
DMA Controller 1, 8237A-5
020-03F
Interrupt Controller 1, 8259A, Master
040-05F
Timer, 8254-2
060-06F
8742 (Keyboard Controller)
070-07F
Real-time Clock, NMI
(Non-maskable Interrupt) Mask
080-09F
DMA Page Memory, 74LS612
0A0-08F
Interrupt Controller 2, 8259A
0C0-0DF
DMA Controller 2, 8237A-5
0E8
Shadow RAM and Cache Control Bit
0F0
Clear Numeric Processor
Extension Busy
0F1
Reset Numeric Processor Extension
0F8-OFF
Numeric Processor Extension
1F0-1F8
Fixed Disk
200-207
Game I/O
278-27F
Parallel Printer Port 2
2F8-2FF
Serial Port 2
300-31F
Prototype Card
360-36F
Reserved
378-37F
Parallel Printer Port 1
380-38F
SDLC, Bisynchronous 2
3A0-3AF
Bisynchronous 1
3B0-3BF
Monochrome Display and Printer Adapter
3C0-3CF
Reserved
3D0-3DF
Color/Graphics Monitor Adapter
3F0-3F7
Diskette Controller
3F8-3FF
Serial Port 1
Note:
The I/O address hex 000 to 0FF are reserved for the
system board I/0. Hex 100 to 3FF are available on the
I/O channels.
Appendix C
u
C-2
