The planisphere was a star chart invented by Ab Rayhn al-Brn in the early 11th century.Otice in the Des Moines Register, Arthur.

Seemingly, multitasking would cause a computer that is switching between several programs to run more slowly, in direct proportion to the number of programs it is running, but most programs spend much of their time waiting for slow input/output devices to complete their tasks.Charles Babbage: Pioneer of the Computer.

The sequence of operations that the control unit goes through to process an instruction is in itself like a short computer program, and indeed, in some more complex CPU designs, there is another yet smaller computer called a microsequencer, which runs a microcode program that.The fundamental concept of storing programs in the computer's memory alongside the data they operate on is the crux of the von Neumann, or stored program citation needed, architecture.These can be useful for creating complicated conditional statements and processing boolean logic.