INT 2F - SMARTDRV v4.00+ - GET CACHE SIZE
        AX = 4A10h
        BX = 0004h
Return: AX = current size in elements???
        BX = largest number of elements
        CX = size of elements in bytes
        DX = number of elements under Windows
Note:   this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0005h

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