140 Appendix A: Specification tables
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) Function
0000-001F DMA controller
0020-0021 Interrupt controller 1
0040-0043 System timers
0060 Keyboard/mouse controller
0061 System control port B
0064 Keyboard/mouse controller
0070-0071 RTC/CMOS and NMI mask
0080-008F DMA controller
00A0-00A1 Interrupt controller 2
00B2-00B3 Reserved
00C0-00DF DMA controller
00EA-00ED Reserved
00F0-00FF Math coprocessor
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