1.Hard disk drives , floppy disk drives and _______drives serve as both input and output.
2.One means by which this is done is with a special signal called an _______ which can periodically cause the computer to stop executing instructions where it was and do something else instead.
3.A general purpose computer has four main components: the arithmetic logic unit (ALU),_______, the memory, and the input and output devices (collectively termed I/O).
A.the control unit
4.In almost all modern computers, each memory cell is set up to store binary numbers in groups of_______ (called a byte).
Each byte is able to represent 256 different numbers (2^8 = 256); either from 0 to 255 or -128 to +127.
5.Some computers are designed to_________ their work across several CPUS in a multiprocessing configuration.
1.A general purpose computer has four main components: the arithmetic logic unit (ALU), the control unit, the memory, and the input and output devices （collectively termed I/O). These parts are interconnected by buses, often made of groups of wires.
Inside each of these parts are trillions of small electrical circuits which can be turned off or on by means of an electronic switch. Each circuit represents a bit (binary digit) of information so that when the circuit is on it represents a “1”, and when off it represents a “0” (in positive logic representation). The Circuits are arranged in logic gates so that one or more of the circuits may control the state of one or more of the other circuits.
The control unit, ALU, registers, and basic I/O (and often other hardware closely linked with these) are collectively known as a central processing unit (CPU). Early CPUs were composed of many separate components but since the mid-1970s CUPs have typically been constructed on a single integrated circuit called a microprocessor.
The control unit (often called a control system or central controller) manages the computer’s various components; it reads and interprets, (decodes) the program instructions, transforming them into a series of control signals which activate other parts of the computer. Control systems in advanced computers may change the order of some instructions so as to improve performance.