The Memory class by default creates an array of bytes with a size of 65536. This is the maximum size of the 6502, but if desired it can be reduced to a smaller size. The memory can be accessed using the [] operator as magic methods __getitem__ and __setitem__ are implemented. When memory is created the size is validated to at least two pages and a maximum size of 65536 bytes, and an exception is raised if the size is not valid. The address is also validated when accessing memory to make sure we stay within boundaries. And finally, the __setitem__ method also verifies that only 8-bit values are written.