* [[Media:C64 pla dissected r1.1 a4ds.pdf|PLA chip dissected]]
* [[Media:Inside Commodore DOS.pdf|Inside Commodore DOS]]
* [https://www.c64-wiki.com C64 Wiki] [https://codebase64.org/ Codebase64 Wiki]
* [https://www.oxyron.de/html/registers.html Oxyron IC reference]
* [https://problemkaputt.de/pagezero.htm Noca$h's Pagezero]