How to Determine Commodore 64 KERNAL Version
Both POKE 1024,1 and ?PEEK(65408) will return different results depending on what KERNAL revision you have in your Commodore 64.
A re-formatted excerpt from the long-form video "43-Year-Old INPUT Bug Fixed: From C64 to VIC-20" • 43-Year-Old INPUT Bug Fixed: From C64...