Int 67H [EMS 4.0] Function 5DH (93) Subfunction 01H Disable EMM operating-system functions

Disables the operating-system—specific EMM functions (Int 67H Functions 59H, 5BH, and 5DH) for calls by application programs and device drivers, reserving the use of these functions for the operating system.

Call with:

AH = 5DH

AL = 01H

BX:CX = access key (if not first call to function)

Returns:

If function successful

AH = 00H

BX:CX = access key (if first call to function)

If function unsuccessful

AH = error code

Notes:

An access key is returned in registers BX and CX on the first call to Int 67H Function 5DH Subfunction 00H or 01H. The access key is required for all subsequent calls to either function.

This function is intended for use by operating systems only.