http://personalpages.tds.net/~rcarlsen/cbm.html Ray Carlsen´s eminenta sida om Commodore-reparationer och modifikationer
http://staff.washington.edu/rrcc Inscannade servicemanualer (mest kretsscheman), Commodore
http://www.zimmers.net/anonftp/pub/cbm/schematics Inscannade servicemanualer, Commodore