Computer Memory, Bus and Printer

 Memory : A storage place where we can store and execute data and program.

Memory Hierarchy:

Memory:

1. Primary Memory

A. Random Access Memory(RAM) or Main Memory

i) Static Random Access Memory(SRAM)

ii) Dynamic Random Access Memory(DRAM)

[SDRAM(Sychronous DRAM)

DDR 3/4 : Double Data Rate SDRAM]

B. Read Only Memory (ROM)

i) Programmable Read Only Memory(PROM)

ii) Erasable Programmable Read Only Memory(EPROM)

iii) Electrically Erasable Programmable Read Only Memory(EEPROM)

iv) Ultra Violet Read Only Memory(UVROM)

2. Secondary Memory

Magnetic Tape

Harddisk

SSD(Solid State Device)

Pendrive

Floppy Disk

Memory Card

Zip Drive

3. Cache Memory(High Speed SRAM) : In between CPU and Main Memory

L1 Cache

L2 Cache

Question:

1. What is Memory?

2. Differentiate between Primary and Secondary Memory.

3. Draw the Memory Hierarchy.

4. RAM, ROM, SRAM, DRAM, DDR, SDRAM, SSD, PROM, EPROM

EEPROM, UVROM- Write the full form.

5. Differentiate between RAM and ROM.

6. What is Cache Memory?

12.10.2020

BUS: Communication Channel

Carry: Data, Control, Memory Address, Power

CPU  :  Memory and Input/Output Device

10 START : Start the Program: Instruction : Control

20 INPUT A : Instruct to input device to take data.

30 INPUT B

40 LET C=A+B : Do the sum of A and B : Intruction : Control

Address

50 PRINT C : Print the result onto Output device.

60 STOP : Stop the program: Control

Classification of Bus:

1. Internal Bus/System Bus

a. Address Bus

b. Data Bus

c. Control Bus

d. Power Bus

2. External Bus

USB(Universal serial Bus)

What is Bus?

Memory and I/O devices are connected to the CPU through a 

group of channels is called Bus to transfer data, address, 

control or power.

What is Internal Bus?

The communication channels(Bus) inside the computer

system basically in Mother Board is called Internal Bus.

Address Bus: A bus that carries the address of Memory location or

an I/O device that the CPU wants to access.

The address bus is unidirectional.

Data Bus: A bus that carries the data from CPU to memory

(or I/O devices)or vice-versa is called Data Bus.

The Data bus is Bi-directional.

Control Bus: A bus that carries the Control from CPU to memory

(or I/O devices)or vice-versa is called Control Bus.

The Control bus is Bi-directional.

External Bus: A bus that is used in outside of computer to 

transfer data or power is called external bus.

USB

Question: Definition, Classification

  Comparison between buses(Address, Data and Control)

*** Computer Science(COMS): Joyrup Bhattacharaya, Sanmay Kundu

Soft Copy Device: SEE(Monitor)

Hard Copy Device: GET (Printer)

Output Device: Printer

1. Character Printer

2. Line Printer

3. Page Printer

4. Thermal Printer

ppm(page per minute)

1. Impact Printer

2. Non-Impact Printer