RGB Spectrum in Alameda, Calif., is introducing the SynchroMaster 555 overlayer/keyer that combines images from two high-resolution computer sources or image generators into one composite image. The two computer signals-one foreground and one background-are digitized, synchronized, and combined at resolutions as fine as 1920 by 1200 pixels. The unit, which supports one dual RGB or DVI channel and a second RGB channel, can synchronize and combine signals of different line and frame rates and interlacing formats. The combined output signal can be RGB or DVI. Using a single chroma-key technique, the background signal is visible through the foreground signal wherever the foreground signal falls within a specified color range. Either channel can be configured as the foreground or the background signal. The SynchroMaster 555 is for simulation, console displays, command and control, and weapons control systems. For more information contact RGB Spectrum online at www.rgb.com.