The MC141543 is a high performance HCMOS device designed to interface with a microcontroller unit to allow colored symbols or characters to be displayed on a color monitor. The onchip PLL allows both multisystem operation and selfgeneration of system timing. It also minimizes the MCU's burden through its builtin 493 bytes RAM. By storing a full screen of data and control information, this device has a capability to carry out `screenrefresh' without MCU supervision.