Isaac,
I have used the PIC18F252 (no zero at the end) bootloader from http://www.etc.ugal.ro/cchiculita/so...bootloader.htm
on a PIC18F2520 chip, and it did work correctly. The site says you can use a PIC18F4520 with the same bootloader code. If you look on the page I linked, you will notice what different chips operate with their Tiny bootloader. This might mean that the same would be true with Micro Code Studio's bootloaders. You might try a couple close chips hex code from MCS, and see if it works.
Or, you could use the Tiny bootloader instead. But I agree, it is nicer to be able to do it right from inside micro code studio.
On a side note, with Tiny Bootloader they give you the assembly code for the bootloader, so you can add in two lines to change the hardware serial port to inverted. That way, you can do without a max232 chip.
As far as the worms, I am not sure if it is a single serving, or family sized can. I have only used the PIC18F2520, and not the predecessors. But if you ever made the move from PIC16 to PIC18 devices, it's got to be a piece of cake in comparison.
Walter
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