Category: DOS extenders
Flags: available only in protected mode
INT 21 - Phar Lap 386/DOS-Extender VMM - EXHANGE TWO PAGE-TABLE ENTRIES AX = 251Fh BL = address type 00h linear address ECX = linear address of first page table entry EDX = linear address of second page table entry 01h pointer ES:ECX -> first page table entry ES:EDX -> second 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 SeeAlso: AX=251Dh,AX=251Eh