Specifications

Software Configuration
3–31
The I/O port functions and addresses (except for a few “Ampro reserved” addresses) shown in the table
are all standard for PC compatibles from both a hardware and software perspective.
Typically, the ROM BIOS provides all the services needed to use the onboard devices and devices
connected to I/O ports. If you need to directly program the standard functions, refer to a programming
reference for the PC/AT.
Note
Other I/O ports below 100h are reserved for internal system
functions and should not be accessed.