Mousepound64
There is a certain hacker ethos to mousepound64. The Commodore 64 was never designed to handle a precise pointing device. Its CPU runs at just 0.985 MHz. When you move a mouse, the computer has to stop everything else to poll the mouse position dozens of times per second. Getting this to work without crashing the system or corrupting screen memory is a programming marvel. Developers who contribute to mousepound64 are celebrated as "wizards" because they are essentially making a bicycle fly.
It is not a keyboard with a mouse attached. It is a pound —a term borrowed from animal husbandry, referring to a place where lost things are kept. The MP64 is where your cursor goes to be found again. mousepound64