Int 67H [EMS 4.0] Function 5BH (91) Subfunction 02H Get size of alternate map register save area

Returns the amount of storage needed by Int 67H Function 5BH Subfunctions 00H and 01H.

Call with:

AH = 5BH

AL = 02H

Returns:

If function successful

AH = 00H

DX = size of buffer (bytes)

If function unsuccessful

AH = error code

Note:

This function is intended for use by operating systems only and can be disabled by the operating system at any time.