I wired up my 23” monitor to my ic-7610, but I lose my computer monitor. I do not want to buy a new monitor, what kind of switch do I need to switch back and forth. I know they make them because I had one 20 years ago. My ASUS Radeon 670 video card has two DVI-D sockets. High dollar card in its day. That also tells me that maybe I can switch from the computer. HELP Please.