8088

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Pinout (DIP40)

        +--\/--+
    GND | 1  40| Vcc
    A14 | 2  39| A15
    A13 | 3  38| A16/S3
    A12 | 4  37| A17/S4
    A11 | 5  36| A18/S5
    A10 | 6  35| A19/S6
     A9 | 7  34| SS0 (High)
     A8 | 8  33| MN/MX
     A7 | 9  32| RD
     A6 |10  31| HOLD (RQ/GT0)
     A5 |11  30| HLDA (RQ/GT1)
     A4 |12  29| WR (LOCK)
     A3 |13  28| IO/M (S2)
     A2 |14  27| DT/R (S1)
     A1 |15  26| DEN (S0)
     A0 |16  25| ALE (QS0)
    NMI |17  24| INTA (QS1)
   INTR |18  23| Test
    CLK |19  22| Ready
    GND |20  21| Reset
        +------+

Frequency: set reader to FREQ, put black probe to GND, red probe to 19 to measure CPU clock