Arduino w/ More than 256k Memory

[djsfantasi]

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.

[pert]

There are many Arduino boards with 512 kB or more of flash memory.

Here are some of the most popular:

• Arduino Nano 33 BLE: 1 MB
• Teensy 3.5: 512 kB
• Teensy 3.6: 1 MB
• Teensy 4.0: 1 MB
• ESP8266: Up to 16 MB, depending on which board model you use (the flash chip is separate from the microcontroller so the board manufacturer decides how much memory to provide).
• ESP32: Up to 3 MB

Is there a shield with extra memory?

Extra memory, yes. Extra program memory, no.