INT 67H 5dxxH: Enable/Disable OS Function Set Functions
Compatibility: EMS 4.0+
Expects: AX 5dH
AL subfn: 00H=Enable all OS-only EMM functions
01H=Disable all OS-only EMM functions
02H=Free access key (enable next caller to get a key)
BX,CX access key
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Returns: AH EMM status (0=successful)
BX,CX (fns 5d00H and 5d01H) access key (returned only the first
time called or after using fn 5d02H).
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Info: These fns are used by an operating system in an effort to keep
programs from performing certain OS-level EMS operations. It is
not to be used by applications.
The first call to fns 5d00H or 5d01H obtain a 32-bit value which
must be used in subsequent calls to 5dxxH fns.
See Also: INT 67H: EMM Services
Extended Memory Specification (XMS)
Interrupts and BIOS Services
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