Systems for changing hardware parameters using sub-CPU for sensing specialized key inputs and main CPU for changes

摘要

A register is provided for storing a key selection data indicating which key is depressed. A keyboard controller sets the key selection data to the register in response to the depression of the key. A timer interrupts a CPU at a predetermined interval. Each time being interrupted, the CPU refers the register to recognize which key is depressed and and performs switching of a hardware status if the key selection data indicates that a key assigned to switch the hardware status is depressed.