INT 1A - PCMCIA Socket Services - SET PAGE
        AH = 8Bh
        AL = adapter number
        BH = window number
        BL = page number
        DX = page attributes
            bit 0: page enabled
            bits 15-1 reserved (0)
        DI = memory card offset (4K units)
Return: CF clear if successful
            AH destroyed
        CF set on error
            AH = error code (01h,02h,07h,08h,11h) (see AH=80h"PCMCIA")
Notes:  this function is only valid for memory-mapped windows
        the socket being operated on is implied by the previous AH=89h call
SeeAlso: AH=89h,AH=8Ah

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