Analog computers operate on a different principle. If you replace analog components (amplifiers, capacitors) logic programming. Analog computers were used more frequently used for the simulation of control processes (see: Control Engineering), but are now almost completely been replaced by digital computers. In a transitional period, there were also hybrid machines that a combined analog to a digital computer.
Fujitsu ScanSnap S1500
The general principle applied today, known for his description of John von Neumann in 1946 as a von Neumann architecture defines a computer for five main components:
* The processing unit (arithmetic logic unit (ALU)),
* The control unit,
* The bus unit
* The storage and
* The input and output unit (s).
In today's computers are the ALU and the control unit usually fused into a single device, known as the CPU (central processing unit, central processor).