This project was started right after the rules for 1kB contest went official. In the meantime I went on wrong path (using HD44780 LCD module), then went on good one (I hope so), designed and built prototype.
The user IO isn't the most friendly, but it keeps some heritage from the BF language itself. This project brings complete BF computer which can edit and run BF programs as well as data inputs to the BF machine, yet still hopefully keeps within contest limits.
I had no banana, so I used 9V battery for scale.