INT 67,5D - Enable/Disable OS Functions (LIM EMS 4.0+)

AH = 5D

AL = 00 enable OS function Set

01 disable OS function Set

02 return access key

BX,CX = access key returned by first invocation

on return:

AH = status (see ~EMS STATUS~)

BX,CX = access key, returned only on first invocation of function

- function 2 resets memory manager, returns access key at next

invocation