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The way people used to program games isn't much like how they program them now.
The original Game Boy, released in 1989, was a hugely popular handheld gaming device -- but it was tricky to program for.
A new video showcases exactly how the device's processor worked, and how programming for the system required developers to understand that to make anything to appear on its screen.
It's a fascinating look at one of the most successful handheld consoles ever, and it follows on from another video that takes a look inside its hardware.