Adding GPIO - IO from Scratch - Part 1

In this video I add some simple GPIO lines to my homebrew cpu.

This circuit is extremely simple compared to some of the projects we’ve interfaced to the CPU but I want to interface a few components by what is colloquially called “bit banging” and to do that I need some general purpose I/O lines. This is really a reminder of how simple things can be but it also means I can move on and interface some circuits in future videos without the distraction of the cpu interface.

0:00 Introduction 0:32 Interfaces so far 2:51 Build 3:25 Build - Output 4:26 Build - Input 7:17 Stand alone test 9:33 Extra breakout 11:03 Integration 11:20 Adding software support 15:17 First testing 16:37 Test program 19:16 Outro ... https://www.youtube.com/watch?v=Xw-9M0KSgM8