standard> The physical and electrical specification for the connector used by some of Intel' smicroprocessor cards, currently (August 1999) the sEPPCeleron and the sECCPentium II. slot 1 is a departure from the square ZIFPGA/sPGAsockets 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)