I moved from a 16F877 to a 18F4620 and can't get the latter to work. The 877 programs in 4 or 8 bit modes and is 100%. The 4620 shows only 2 lines all blanked dark. The only difference between the two codes is the config setup since the 4620 has to use the MPASM for assembly. I ran a blink test with the current config settings and it was OK. I have tried 4-bit and 8-bit modes, same result. The 4620 is the same pinout as the 877 except the 4620 has a couple of pins multiplexed for other uses. Is there something simple I am overlooking?