NES Controllers Explained

NES Controllers Explained
In this episode I break down a NES-004 brick style controller and explain how it works, from both a hardware and software perspective.

Controller Code GitHub Project – https://ift.tt/zgqPFGV
CD4021 Datasheet (Texas Instruments) – https://ift.tt/Piov0Xy

Chapters:
0:00 Introduction

1:20 Opening a Controller
2:28 NES-004 Electronics
4:18 Button Circuitry
7:10 Reading Controller Data
9:37 Controller Code
16:20 Conclusion
via YouTube https://www.youtube.com/watch?v=nAStgQzPrAQ