
PMAC2-Lite Hardware Reference Manual
HOST PC-AT I/O ADDRESS MAP
Hex Range
Dec Range
Usage
000-01F
0-31
DMA Controller 1 8237A-5
020-03F
32-63
Interrupt Controller 1 8259A
040-05F 64-67
Timer
8254-2
060-06F 96-111
8042
(Keyboard)
070-07F
112-127
Real-time clock, NMI mask
080-09F
128-159
DMA Page Registers
0A0-0BF
160-191
Interrupt Controller 2 8259A
0C0-0DF
192-223
DMA Controller 2 8237A-5
0F0-0FF 240-255
Math
CO
processor
1F0-1F8 496-504
Fixed
Disk
200-20F 512-527
Game
Control
210-217
528-535
Expansion Unit (usually open)
278-27F
632-639
Parallel Printer: LPT2
2B0-2DF 688-735
Alternate
EGA
2F8-2FF 760-767
Asynchronous
Common:
COM2
300-31F
768-799
Prototype Card (usually open)
360-36F 864-879
PC
Network
378-37F
888-895
Parallel Printer: LPT1
380-38F
896-911
SDLC Communications 2
390-393 912-915
Cluster
3A0-3A9
928-937
SDLC Communications 1
3B0-3BF
944-959
IBM Monochrome Display/Printer
3C0-3CF 960-975
Enhanced
Graphics
Adapter
3D0-3DF 976-991
Color/Graphics
3F0-3F7 1000-1015
Diskette
Controller
3F8-3FF 1016-1023
Asynchronous
Common.:
COM1
x2E1
GPIB
Adapter
x390-x393
Cluster
Adapter
The above chart helps prevent possible contention with existing I/O. If a contention occurs, try a
new unused address.
Contention is exhibited by:
•
•
•
Total Malfunction
Partial Function, Input O.K., Output bad or vice versa
Intermittent operation
Host PC-AT I/O Address Map
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