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INT 67h, 44h MAP MEMORY
On entry:
AH = 44h
AL = physical page number (0-3)
BX = logical page number
DX = handle
Return:
AH = status
00h function successful
80h internal error
81h hardware malfunction
83h invalid handle
84h undefined function requested
8Ah invalid logical page number
8Bh illegal physical-page number