68705

8-bit EPROM Microcomputer Unit

Pinout

DIP28
         +---\/---+
     Vss | 1    28| *RESET
    *INT | 2    27| PA7
     Vcc | 3    26| PA6
   EXTAL | 4    25| PA5
    XTAL | 5    24| PA4
     Vpp | 6    23| PA3
   TIMER | 7    22| PA2
     PC0 | 8    21| PA1
     PC1 | 9    20| PA0
     PC2 |10    19| PB7
     PC3 |11    18| PB6
     PB0 |12    17| PB5
     PB1 |13    16| PB4
     PB2 |14    15| PB3
         +--------+

Frequency

DIP28
Set reader to FREQ, put black probe to GND, red probe to 4 and 5 to measure CPU clock
Guru's comment: 15, 23/24/25(vsync sometimes)

External links

68705 page on CPU-World

Files

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  68705 Datasheet