The architecture describes a computer with four main sections: the arithmetic and logic unit (ALU), the control circuitry, the memory, and the input and output devices (collectively termed I/O).

• 早于一八二零年， 系第一个设计可以编写程式嘅计算机。不过由于嗰时技术有限，亦都唔够钱，始终都无办法实现到。