System Input/Output Addresses - IBM Aptiva Handbook

System input/output addresses

Table 10 shows the default hexadecimal addresses for each of the system board input/output (I/O) functions. You can
use this information if you install an adapter card that requires you to set I/O addresses.
Additional resources may be taken by Plug and Play (PnP) devices. Resources for installed PnP devices, such as the
modem card, can be reassigned by the BIOS or the Windows 95 Device Manager.
Note: If your computer came with a joystick, the I/O address for this joystick should not be changed.
Table 10: System I/O addresses
Address range (hexadecimal)
0000-001F
0020-0021
0040-0043
0060
0061
0064
0070-0071
0080-008F
00A0-00A1
00B2-00B3
00C0-00DF
00EA-00ED
00F0-00FF
140 Appendix A: Specification tables
Function
DMA controller
Interrupt controller 1
System timers
Keyboard/mouse controller
System control port B
Keyboard/mouse controller
RTC/CMOS and NMI mask
DMA controller
Interrupt controller 2
Reserved
DMA controller
Reserved
Math coprocessor