- CuriousMarc: https://www.youtube.com/channel/UC3bosUr3WlKYm4sBaLs-Adw
- Ben Eater: https://www.youtube.com/channel/UCS0N5baNlQWJCUrhCEo8WlA
- Fran Blanche: https://www.youtube.com/channel/UCMLgHbpJ8qYqj3CkdbvC0Ww
- Ben Eater: https://www.youtube.com/channel/UCS0N5baNlQWJCUrhCEo8WlA
- Fran Blanche: https://www.youtube.com/channel/UCMLgHbpJ8qYqj3CkdbvC0Ww
CuriousMarc has an amazing series on the Apollo Guidance Computer, as well as great one-off videos like running a linux terminal on a teletype (https://youtu.be/2XLZ4Z8LpEE).
Ben Eater does amazing videos on low level electronics, and has a great series on understanding how a computer really works.