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The ATmega1284 just came out and it has the exact same pin out. In addition to that the chip has more flash and sram, and probably eeprom. There is a neat pcb style board called the sanguino that also uses the ATmega644p (could use 1284). The board is set up to use a usb ftdi cable instead of a usb B cable. http://sanguino.cc/This is the board I used in my firefighting robot woody.http://www.societyofrobots.com/robotforum/index.php?topic=7653.0
mouser.com has them
I made a mistake in my previous email, I actually meant Mouser instead of DigiKey.Availability: on order, Estimated Ship Date 07/08/2009