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Jumper    Function            Pins               Setting

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P1        Speed Select        1-2 25 MHz [50]

                              2-3 33 MHz [66]

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P2        Processor Upgrade   1-2 PQFP           Socket Not Used

          Socket Select       2-3 PGA            Socket Used

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P3-P5     Processor Select    ODPR               ODP

                              486SX (PQFP)

                              486DX              487SX

                              486DX2             Overdrive     486SX (PGA)

          P3                  Pins 1-2           Pins 1-2      Pins 2-3

          P4                  Pins 1-2           Pins 1-2      Pins 2-3

          P5                  Pins 1-2           Pins 2-3      Pins 3-4

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P6        Password Erase                         Remove and replace jumper 

                                                 P6 to clear password.

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P7        External Modem      1,2                Internal Modem ROM

          ROM Enable          2,3                External Modem ROM

          (if P7 is 

          installed) 

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J16       Replacement                            Use only 4.5v Alkaline 

          Battery Connector                      Computer Battery

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NOTE: The 486SX (PQFP) is not socketed. The other processors are all PGA

      processors that plug into the processor upgrade socket.