Abstract: A control device for power saving for personal computers, printers, etc. which generates a suspension signal or a power-off signal to perform power saving by detecting input horizontal and vertical sync signals. The suspension signal provides a suspension mode for a minimum basic operation of the computer or printer, while the power-off signal provides a system power-off mode. The control device is designed as a digital circuit comprising latches, counters, monostable multivibrators, and other logical elements. Integration of the circuit is possible as well as its transient response characteristic is improved.