More card, free a port, DVI-I(interface, video, digital) are, especially for output to a monitor from which a digital signal uses, etc. is designed. DVI-I compliant DVI by Working Group Digital Display is created, which is a standard procedure to maintain a digital signal is traced, that an analog signal needs and the popular and low-cost. More card, video port, VDI-I also have a port, standard VGAand are, therefore, two task module. delivery of an analog signal to the VGAand a digital signal to a port, DVI-I.