Int 21 Fn 251E  OP - Phar Lap 386/dos-extender Vmm V2.1c - Write Page-tab  [E]

   AX = 251Eh
   BL = address type
       00h linear address
       ECX = linear address of page table entry to read
       01h pointer
       ES:ECX -> page table entry to read
   EDX = new value for page table entry

Return: CF clear if successful
   CF set on error
       EAX = error code
       09h invalid address or NOPAGE option set
       82h not compatible with DPMI

Note:  this call is obsolete; use AX=252Bh/BH=0Ah instead

See Also: AX=251Dh,AX=252Bh/BH=0Ah,INT 31/AX=0507h