INT 62 u - FGDRIVER v3.03 - "FG_SAVE" - COPY REGION FROM VISIBLE TO HIDDEN PAGE
        AX = 0087h
        BX = left edge column
        CX = right edge column
        DX = top edge row
        SI = bottom edge row
Notes:  For FGDRIVER v1.10, this function was unused; "FG_SAVE" was AX=005Ah
        The left and right edges are adjusted to byte boundaries if necessary
SeeAlso: AX=0083h,AX=00A6h

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