https://m.youtube.com/watch?v=kWLKA5zRrQ0
Look at DoshDoshingtons Circuits Explained Under Three Minutes video.
At some point he mentions Memory cells, useful to, eg. count each thing that goes past a section of belt.
Is this video, circuits
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Yes, is it actually under three minutes.
Music Used:
Kirby Nightmare in Dreamland - Butter Building