The physical and electrical specification for the connector used by some of intel's microprocessor cards, currently (August 1999) the sepp celeron and the secc pentium ii.

Slot 1 is a departure from the square zif pga/spga sockets used by pentium and earlier processors, the processor being 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.

See also slot 2, slot a.