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Your PC’s Video Ports

The video port has been around for many years and still rocks! Virtually all video cards still offer the same 15-pin, D-SUB video port that originally appeared with the IBM Video Graphics Array (VGA) specification.

However, another new face is on the block: the 29-pin, DVI-I port, which is used to connect digital flat-panel (also called liquid crystal diode, or LCD) monitors. This figure shows the business end of a typical video card that offers both ports onboard.

Most video cards offer both a VGA and a DVI-I connector.
Most video cards offer both a VGA and a DVI-I connector.

Virtually every card that has both these video ports can use two monitors at a time — either showing an expanded desktop, where your mouse moves seamlessly from one monitor to the other (like in this figure), or two separate and discrete desktops.

In a pinch, a DVI-VGA adapter allows you to use the DVI-I port to connect a standard cathode ray tube (CRT) monitor, so you can use two analog monitors instead.

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