From LXF Wiki
A pre-Amiga history of Commodore Business Machines can be found at [CBM History (http://www.commodore.ca/products/default.htm)], it includes the Vic20 and C64 range of Computers that were popular with home users during the early eighties.
It includes famous trivia answers to questions such as the following.
The most common C64 question is why does the screen say 38,911 bytes free when it supposedly has 64,000 bytes of memory. This is because nearly half of its memory is used for internal functions like the operating system, Basic 2.0.