The physical and electrical specification for the connector used by some of Intel' s microprOcessor cards, currently (August 1999) the SEPPCeleron and the SECCPentium II. Slot 1 is a departure from the square ZIFPGA/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)