Is the 'source code' for the ATMEGA available anywhere

So yeah, still got trouble with my MakerBuino BUT - I do have a bog-standard arduino. If i’d have the code needed to bootstrap my arduino, and I hook up the screen correctly, I can at least verify the screen is working.

So, is that code available anywhere?

I was given this link for the makerbuino bootloader source code if its any help??.

makerbuino source code

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So if you just want to test the screen, it’s a Nokia 5110 screen - This tutorial from Sparkfun should let you see if the screen is working.
They provide a sketch that should let you test it - Adafruit also has a 5110 library - which has some different sketches in it.