Serpent Unary Computer

"Thank you for purchasing the Unary Computer, also known as Serpent.  [..] The underlying atom of the machine is the 'unit' which stands for unary integer. There are 1,000,000 units in your machine. Rather than copying information to and from segments of memory, this computer simply transfers units between segments of memory. There is a constant number of units in the machine at all times. The Serpent comes packaged with a simple, case-insensitive assembly language."

-Serpent Unary Computer Manual