The MB90091A is the multisync, on-screen display controller that supports a variety of TV systems such as NTSC, PAL, double-scan NTSC, double-scan PAL, 1250HDTV, and 1125HDTV as well as personal computer monitor display systems such as VGA and XGA. The MB90091A contains display memory (VRAM) and character font ROM, allowing characters to be displayed with few external devices. The device also contains command table ROM storing display command data, minimizing the load on the microcomputer. The on-screen display configuration is up to 24 characters x 12 lines, with each character consisting of 24 x 32 dots. The font ROM integrates 512 different character patterns. The character signal output is an RGB1 digital output. The display color of each character can be specified from among 16 colors. A color/monochrome select signal output is also provided for display either in 16 different colors or in 16-level gray scale. The character display functions include character background display, shaded background display, and sprite character display functions, contributing to providing colorful display screens.