The 8-Bit Guy has some great videos about how graphics worked on the older systems (including C=64): <a href="https:&#x2F;&#x2F;youtu.be&#x2F;Tfh0ytz8S0k" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;Tfh0ytz8S0k</a>