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        Move bitmap to scanline

        Entry:
          AX = CD04h
          CX:BX -> structure (see below)
        Return:
          AL = 00h successful
             = 80h unsuccessful
             = 81h scan line out of range
             = 82h unsupported scan line density
             = 83h out of memory
             = 84h unrecognized source
             = 85h initialization error

        Format of structure:

        Offset  Size    Description
         00h    WORD    image source (0 = conventional memory,
                                      1 = expanded memory)
         02h    DWORD   pointer to image data
         06h    WORD    scan line on which to place
         08h    WORD    bit offset from start of scan line at which to place
         0Ah    WORD    density of bitmap data (300, 600, or 1200 dpi)
         0Ch    WORD    width in bits of data
         0Eh    WORD    source logical page number
         10h    WORD    source handle (only if source in expanded memory)
         12h    WORD    source offset (only if source in expanded memory)