INT 67,48 - Restore Page Map Context (LIM EMS 3.0+)

AH = 48h

DX = EMM handle assigned to the interrupt service routine

servicing the interrupt

on return:

AH = 00 success

= error code (see ~EMS STATUS~)

- any TSR, ISR or device driver using EMS should save contexts

before manipulating EMS memory and restore contexts afterwards

- registers not listed are preserved