The Mega 128 could work with arduino open source tools by retargetting them.
ATMEL documented its JTAG Debugger
But debug wire is the only way to debug avr128 so users would need dragon
here are some places with the debugger schematic
http://aquaticus.info/JTAG
I wonder if atmel also released schematics for debug wire?
Open source debugger & Mega126
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