And Melanie, I'll kill you if you tell me to look for this stuff in page xx sub xx sub xx of the documentation, because I cant find it
*smiles*

1. If you had attempted a compile with an 18F part using the standard (default) PM Assember, one of the first lines to hit your screen would have been...

"Error: PM does not support this device. Use MPASM."

This is (in case you missed it) a clue to get you on the right track...

2. If you had ever compiled using MPASM, at the end of the listing (file.LST) it says BYTES for 18F series and WORDS for the 12F, 16F etc... The PICs DATASHEET (here we go I feel a fatwa coming on - btw, does anybody ever get a thin one?), anyway check the 18F452 Datasheet MEMORY ORGANISATION chapter and you discover...

"The PIC18F252 and PIC18F452 each have 32 Kbytes of FLASH memory, while the PIC18F242 and PIC18F442 have 16 Kbytes of FLASH. This means that PIC18FX52 devices can store up to 16K of single word instructions, and PIC18FX42 devices can store up to 8K of single word instructions."

Are we still friends Angus or is it Kevlar vest time?

Anyway, digressing... it's time you thought about using the 4520 version rather than the plain 452. Heaps more versatile and CHEAPER too...