PMAC-Lite Hardware Reference
Host PC-AT I/O Address Map
27
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
Contention is exhibited by:
1) Total Malfunction.
2) Partial Function, Input O.K., Output bad or vice versa.
3) Intermittent operation.
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