Int 21 Fn 252B  Pu - Phar Lap 386/dos-extender - Get Page Types            [E]

   AX = 252Bh
   BL = 04h
   ???

Return: ???

Note:  returns one word per page

Bitfields for page information:
 bits 3-0  page type
   0 unmapped
   1 allocated
   2 physical device page
 bit 4 locked
 bit 5 swapped to disk
 bit 6 mapped to read-only data file
 bit 7 mapped to read/write data file