There is no special thing about the PIC in question just that he said that it is the only available PIC in the part of the world he is living. And you know that when you are designing, you also consider the availability of the components.
i see. but i'm not much of a programmer and the available programs is for 16f84 and others. don't know how to reprogram it for 16f877. the loader we have here is only for 16f877. we tried to search for 12vdc to 220ac inverter here, but only modified sine wave is only available, we have to order abroad to get a pure sine wave but our budget is only limited.