I wonder if the button on top means that there is a non-standard chip inside or if it's just some form of reset switch to help with Assembly language programming.
Over 17 million Commodore 64s were sold world wide.
That doesn't count the
C= One or the C64 Direct-to-TV -
Don't forget to check out the C=One project.
C64 Direct-to-TV
-Nyle