this week-2/ session-2 is all about the computer hard ware basics on mother board,CPU and main memory.
motherboard is also known as system board which contains main circuit board in system unit and contains chips, integrated circuit and transistors. the chips packages are available as follows :
1. single edge catact (SEC) Cartridge
2. dual inline package(DIP)
3. Flip chip PGA(FC-PGA)packages
4. pin grid array (PGA)
PROCESSOR-
The most important part of the computer that processes CPU(Central processing unit).
CPU= MEMORY + PROCESSOR
[NOTE:
Sometimes processor itself is called CPU.]
CPU acts like a brain of the computer system that take major decision, all sorts of calculations , controls all parts of the computer functions by activating, controlling the operations that converts data into information to users.
[Measurements in unit = megahertz (MHz)]
CPU is divided into two components:
1. control unit(CU)
> Parts of hardware .
> execute stored program, instructions to computer system .
>communicate with other parts of the hardware.
2. arithmetic logic unit(ALU)
> Performs arithmetic operations. e.g: additional, subtraction, division, multiplication
>performs logical relational operation. e.g: AND, OR, NOT,=,>,<
MAIN MEMORY
Are of two types.
RANDOM ACCESS MEMORY (RAM)
I holds the program instructions and setting required to set up the computer and does not loose it concepts even after the power is turned off.
ROM is also known as firm ware which is installed by the manufacturer itself inside the computer.
TYPES OF ROM
1. PROM ( Programmable, read only memory) _ PROM works similar to ROM for storing data during the power cut off where the data is permanent and cannot be erased.
2. EP-ROM( Erasable, programmable read only memory) _ the data can be read with the help of special device that uses ultra violet light to overcome PROM where the data can be erased and new data can be re-entered. it exactly works as PROM.
3.EEP-ROM ( Electronically erasable programmable read only memory ) _ EEP-ROM helps to avoid the inconvenience if having to take chips out from the computer to change data and instructions or exchange chips to update newdata. this changes are done electronically under the control of software.e.g. to change the prices recorded in the items according to needs of the market.