The very first PIC with EEPROM memory was the 16C84.
The 16F84 is simply the flash memory upgrade to a VERY OLD chip.

I wish everyone would Stop using 16F84's!!!!!!
They are worthless, and very expensive.<hr>As for the error ...

You are probably trying to compile the example that uses Timer1 to blink an LED.
But the 16F84A doesn't have a Timer1. Or a PIR1, or a USART, or an A/D module, or a ....

You could try using Timer0.
The "Combine" example has some Timer0 code.
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