Sony VGN-BX500 - Manual (Page 97)

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Using Peripheral Devices
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DVI-D stands for Digital Visual Interface - Digital. It is a type of DVI connector that supports only digital video signals (no analog video signals). It has
24 pins.
A DVI-I connector (Digital Visual Interface - Integrated) supports digital video and analog video signals. It has 29 pins.
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You can use a TFT/DVI monitor only with a model with the ATI video controller.
A video adapter device is required to connect a VGA monitor using the DVI-D port.