RAM ( Random Access Memory)

RAM (Random Access Memory) is temporary memory it's used to stored data for CPU( Central Processing Unit) and it works when computer is turned on. There are many types of RAM(Random Access Memory):

SDRAM=Synchronus Dynamic Random Access Memory

DRAM=Dynamic Random Access Memory

DDRRAM=Dynamic Double Rate Random Access Memory

Direct RDRAM=Direct Rambus Dynamic Random Access Memory

And for nowadays the commonly use DDRRAM and there are many types of DDRRAM, E.g: DDR1, DDR2......

DDR1

DDR2&DDR3

DDR4

FUNDAMENTAL COMPUTER CONCEPT

• Types of computers :
• Supercomputer
• Mainframe computer
• Minicomputer
• Microcomputer
• Desktop computer
• Notebook computer
• Netbook computer
• Handheld computer
• Tablet PC
• Media computer centre
• Part of computer:
• Hardware:
• Input Device:
• Keyboard
• Traditional keyboard
• Ergonomic keyboard
• PDAs keyboard
• Visuals keyboard
• Wireless keyboard
• Pointing devices:
• Mouse
• Machanical mouse
• Obtical mouse
• Trackball mouse
• Cordless or Wireless mouse
• Pointing sticks
• Touch pad or touch surface
• Joystick
• Touch screen
• Light pens
• Stylus(pen of Handheld)
• Scanning devices
• Optical scanner
• Bar-code reader
• Card reader
• Character 
• Mark recognition devices
• Audio input devices
• Image capturing devices
• Digital camera 
• Digital video camera
• Output devices:
• Monitor
• Printer
• Ink-jet printer
• Laser printer
• Personal laser
• Share laser
• Photo printer
• Portable printer
• Plotter printer
• Audio Output devices
• Speaker
• Telephone
• ...............
• Softwar:
• System software
• Application software

To be continue............

Set computer speak by notepad*Please write these code to notepad and save name.vbs* ::

Dim message, Speak
Message=InputBox("Enter text", "Speak voice by Khim Leader")
Set Speak=CreateObject("sapi.spvoice")
Speak. Speak message

Example of IF statement:(on turbo)

# include<stdio.h>

# include<conio.h>

  voide main();

  {

      clrscr();

      int pay, dis, total;

      printf("Payment=");

      scanf("%d", &total);

      if(pay<200)

      {

              dis=pay*5/100;

              total=pay-dis;

       }

       if(pay>=200)

       {

               dis=pay*15/100;

               pay=total-dis;

        }

        printf("Total=%d", total);

        getch();

   }