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Slot 1 refers to the physical and electrical specification for the connector used by some of Intel's microprocessors, including the Celeron and the Pentium II.
Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. Instead, the processor is mounted on a card, with a 242-lead edge-connector.
The Slot 1 specification allows for higher bus rates than Socket 7. Slot 1 motherboards use the GTL+ bus protocol.