He wanted to be able to calculate binary values without having to jump through hoops or boot up his computer, so he built his own binary calculator. For the brains, he chose an ATTiny2313.

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But not impossible, as YouTuber Joe Price has proved. Price has built a working binary calculator in the game, which can automatically convert binary into decimals and display the results on screen.

I used to write assembler and did a certain amount of arithmetic in binary. What I needed was a binary pocket calculator to check results. But nothing I could find had a binary point, nor a hex point ...