Z80

[Z80 page on Wikipedia]

Pinout (DIP40)

Z80 / Z8400 / D780C | D780C-2 / Z80B
     +--\/--+
 A11 | 1  40| A10
 A12 | 2  39| A9
 A13 | 3  38| A8
 A14 | 4  37| A&
 A15 | 5  36| A6
 (|) | 6  35| A5
  D4 | 7  34| A4
  D3 | 8  33| A3
  D5 | 9  32| A2
  D6 |10  31| A1
 +5V |11  30| A0
  D2 |12  29| GND
  D7 |13  28| RFSH
  D0 |14  27| M1
  D1 |15  26| RESET
 INT |16  25| BUSRQ
 NMI |17  24| WAIT
HALT |18  23| BUSAK
MREQ |19  22| WR
IORQ |20  21| RD
     +------+

Frequency: set reader to FREQ, put black probe to GND, red probe to 6 to measure CPU clock

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[Z0840006PSC page on CPU-World]