Source : Free On-Line Dictionary of Computing

Slot 1
     
         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}.
     
        [bus rates?]
     
        (1999-08-04)