What is a stack and how does it work?

Schematics, datasheets, kits, and more at https://eater.net/6502

Part 1: https://www.youtube.com/watch?v=LnzuMJLZRdU
Part 2: https://www.youtube.com/watch?v=yl8vPW5hydQ
Part 3: https://www.youtube.com/watch?v=oO8_2JJV0B4
Part 4: https://www.youtube.com/watch?v=FY3zTUaykVo
Part 5: This video!

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https://www.youtube.com/watch?v=xBjQVxVxOxc