OK thanks for your explanation.I think my board has the Opti bootloader already.Or is it a seperate sketch that is used to flash other chips?
Do I have to disconnect the USB interface?
Using your explanation I could flash a bootloader.How can I flash a sketch?Or do I have to use the AVR studio to generate a hex file?
I only have one USB interface right now, the one that is on the board.Should I get another USB interface for the external chips?
I don't want to mess up the board more than neccessary and your advice maybe can save me from hours of experiments.Or maybe I should get a seperate flash writer they are not expensive.
nope.. you can use your REAL Arduino for everything you need.. You can turn it into an ISP programmer to get bootloader software on other chips.. or... use it as a 'pass through' device to send sketchs form the IDE through the board onto the target chip/board..etc
Actually, is it possible to use an USB/serial converter to program these Atmel chips