Hi, I couldn't find any PIC18Fxxx suppliers in Australia so I ordered a PIC18F458 from Futurlec (they didn't have PIC18F452 chips in stock) and the datasheets are practically identical. The only differences I can see are a CAN module and "enhanced" CCP module (ie. extra features on the PIC18F458 ). Anyway, this was before I was convinced I should not try to reinvent the wheel and go 100% with MIOS. Now if I had the source to MIOS, I could just open it up in MPLAB and validate that it will work on the PIC18F458 (ie. recompile with different inc file if need be). But since I can't do that, I'll have to just plug it in and see what happens, but then if it doesn't work, I won't know if it's my board, or my programmer not working, or the fact that I'm using a different PIC. Hmm... Any comments/suggestions welcome. Wilba