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[on:]

Hi,
I try to upload a sketch to a ATMEGA 2560 using the arduino IDE and get the following (after upload done....):

avrdude: verification error, first mismatch at byte 0x0634
         0x0e != 0x06
avrdude: verification error; content mismatch

What can it be?
Thanks

[Reply #1 on:]

How old is the board?

Do you have !!! anywhere in your code (other than comments)?

[Reply #2 on:]

The board is new (it is not an arduino board but I use the arduino IDE).
Yes I have some Exclamation marks in the code. Why?

[Reply #3 on:]

Another thing, some of the exclamation marks are for logic not calculation.

[Reply #4 on:]

Some bootloaders use !!! as an "escape" to go into command mode.

[Reply #5 on:]

Does it have to be 3 in a raw?

[Reply #6 on:]

Yes.