## Display Device Driver Reference for OS/2

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### EGA Register Interface Functions

This section describes each EGA Register Interface function in detail. The following list shows these functions by function number (hex):

F0 Read One Register
F1 Write One Register
F2 Read Register Range
F3 Write Register Range
F4 Read Register Set
F5 Write Register Set
F6 Revert to Default Registers
F7 Define Default Register Table
F8 Read Default Register Table
FA Interrogate Driver

Note: Function F9h, and Functions FBh through FFh are reserved.

Each function description includes:

The parameters required to make the call (input) and the expected return values (output)
Any special considerations regarding the function

If the function description does not specify an input for a parameter, it is not necessary to supply a value for that parameter before making the call. If the function description does not specify an output value for a parameter, the parameter's value is the same before and after the call.

Note: The EGA Register Interface does not check input values, so be sure that the values loaded into the registers before making a call are correct.