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
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