Module 5: Introduction to Computer Hardware

Byte

8 bits, using 8 wires on the bus (smallest unit of data transfer)

Bit

A single 1 or 0

I/O Subsystem

All Peripheral devices (input, output, storage, network) where storage consists of the long-term storage devices (disk drives, tape).

Four Components of a computer

CPU, Memory and storage, and peripheral devices (including some network connection) that function together.

Four Components of a computer system

CPU, memory, input/output (I/O) subsystem, and the bus.

IT System

Composed of hardware, software, and people all working towards a common goal.

Digital devices

Digital Data are represented as electrical current being in one of two states: high or low. Each wire allows 1 bit (a single 1 or 0) to flow over it.

CPU

Executes your programs' instructions, but also commands the various components in the computer.

When was the PC first introduced?

In 1984, with the MacIntosh Computer, it was the first the a GUI interface and a mouse as an input device.

Low

Nearly no, or no current flowing. "0"

High

Noticeable current flowing through the component. "1"

Memory

Stores the program(s) being executed and the data that each program is using.

Bus

The device that permits information to move between each component.

Word

typical size of datum