The ADV476 (ADV®) is a pin compatible and software compatible RAM-DAC designed specifically for VGA and Personal System/2 color graphics. The ADV476 is a complete analog output RAM-DAC on a single monolithic chip. The part contains a 256x18 color lookup table, a pixel mask register as well as a triple 6-bit video D/A converter. The ADV476 is capable of simultaneously displaying up to 256 colors, from a total color palette of 262,144 addressable colors. The on-chip asynchronous MPU bus allows access to the color lookup table without affecting the input video data via the pixel port. The pixel read mask register provides a convenient way of altering the displayed colors without updating the color lookup table. The ADV476 is capable of generating RGB video output signals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering. The ADV476 is fabricated in a +5V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation and small board aarea. The part is packaged in a 0.6", 28-pin DIP and a 44-pin PLCC. The ADV476 (ADV®) is a pin compatible and software compatible RAM-DAC designed specifically for VGA and Personal System/2 color graphics. The ADV476 is a complete analog output RAM-DAC on a single monolithic chip. The part contains a 256x18 color lookup table, a pixel mask register as well as a triple 6-bit video D/A converter. The ADV476 is capable of simultaneously displaying up to 256 colors, from a total color palette of 262,144 addressable colors. The on-chip asynchronous MPU bus allows access to the color lookup table without affecting the input video data via the pixel port. The pixel read mask register provides a convenient way of altering the displayed colors without updating the color lookup table. The ADV476 is capable of generating RGB video output signals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering. The ADV476 is fabricated in a +5V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation and small board aarea. The part is packaged in a 0.6", 28-pin DIP and a 44-pin PLCC.