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
