A central processing unit of a mainframe system is configured to load a physical graphic card driver into a memory of the mainframe system for performing a display function when the mainframe system is not connected to an Extensible Firmware Interface (EFI) external graphic card. The central processing unit is further configured to load a virtual graphic card driver into the memory of the mainframe system for performing the display function when the mainframe system is connected to the EFI external display card.
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