A-4
IBM Personal Computer User Guide
System input/output addresses
This table shows the hexadecimal addresses for each of the system board Input/
Output (I/O) functions. You may want to use this information if you install an adapter
card that requires you to set I/O addresses.
Table 3: System input/output addresses
Address range
(hexadecimal)
Function
000-00F DMA controller-1
020-021 Interrupt controller-1
040-043 System timer
060-060 Keyboard controller 8742
061-061 System Speaker
070-071 CMOS RAM Address and Real Time Clock
081-08F DMA controller-2
0A0-0A1 Interrupt controller-2
0C0-0DF DMA controller-2
0F0-0FF Math Co-Processor
170-177 Secondary IDE
1F0-1F7 Primary IDE
200-207 Game Port
278-27F Parallel Printer Port 2
2F8-2FF Serial Asynchronous Port 2
378-37F Parallel Printer Port 1
3F0-3F5 Floppy Disk Controller
3F6-3F6 Secondary EIDE
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