Not all 100 pins of ATMega 2560 are used in arduino mega

Using Arduino Microcontrollers
10

pert:
If you're using MegaCore, you can just use those pins as you would any other Arduino pin. Note that the "MegaCore AVR Pinout" pin mapping does not match the Arduino Mega pin mapping:

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Thanks!!! it works great! i can now use all PIN's that is awesome !!

Greats Mark