I have a project running on an Arduino Mega 2560, whose sketch uses almost ALL of the 256k memory available. I'm already using PROGMEM to store several k of tables.
Of course, I need to add additional features to the sketch. Is there a hardware option with say 512k of sketch memory? Is there a shield with extra memory? I'm looking, but is there a thread on minimizing program memory?
This is a critical project, so any advice is greatly appreciated in advance.