hi i'am programming pic16f84a but the programmer say program operation of program memory failed address 0x0, read 0x3fff,expected 0x1683
but i'am able to program pic16f887 successfully,,please help me why i'am not able to program pic16f84a

 

Check datasheet to see if pic16f84a is compatable with PicKit3. If it is, check that the correct programming pins are connected. May not be the same as pic16f887.

Chips need to be "ISP" types.

 

ICSP support is required for PICkit 3.

A PIC16F84A is an ancient chip - I don't understand why people use it - and it does not support ICSP.

 

I've never used a 16F84A with my PICkit 3, but when I select the device in MPLAB, it says they are compatible. If you're using MPLAB to program and debug, I would try going to the "Configure" menu, then click "Select Device", click the "Device" dropdown menu, and select "PIC16F84A".