SW303 RTP SLOT A sense switch, or program switch, is a switch on the front panel of a computer whose state can be tested by conditional branch instructions in software. Most early computers had several sense switches. They were typically used by the operator to set program options. IBM's first commercial computer, the IBM 701 Defense Calculator, announced on May 21, 1952, had four lights and six switches on the upper right of its front panel marked Sense (see photo).|Formula Satu Musim 2024