A receptacle on a PC motherboard designed to hold a Pentium II microprocessor. The microprocessor, which is encased in Intel’s Single Edge Contact (SEC) packaging, slides into the slot on the motherboard. Slot 1 includes 242 electrical contact points and communicates with the chip’s L2 cache at half of the PC’s clock speed. Slot 1 replaced socket 7 and socket 8 in Intel architectures, but has been superceded by Slot 2 in newer model Pentiums. See also L2 cache, motherboard, Pentium. Compare Slot 2, socket 7, socket 8.