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.