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So, you can see this in this way, you can see this long
thing, that is a RAM, what is called RAM?
See, this is how it looks, if I can enlarge it, this is not
RAM, this is not RAM, this is my RAM, and there are a lot
of images of RAM here, so you can take any images of RAM.
This is not a RAM, just give me a second, let's go back, so
we got an idea
that RAM looks like this, so let's go back and put it here,
let's put CPU, Central Processing
Unit, just give me a second, let's see the images here, and
ok, CPU looks like this, this is the Central Processing
Unit, this is a CPU, apart from this, let's see, Hard
Drive, This is hard disk drive.
This is hard disk drive.
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PDF PDF PDF PDF PDF PDF PDF Here in this file is your CPU
OK In mobile also you have
So, this is CPU
In mobile we call it as processor
So, we will put here CPU and processor
It picks up this file
Which is this icon file
After that it starts to run
It starts to read
If no error is there so it shows it by opening
So, this is my simple FUNDA
Whatsapp.exe
Whatsapp.exe is a binary code
You can see icons on the screen You can see icons on the
screen You can see icons on the screen You can see icons on
the screen Programmer Programmer Programmer Programmer
Programmer Programmer Programmer Programmer Programmer
Programmer Programmer Programmer
Programmer Programmer Programmer Programmer Programmer
Programmer
players have a stand where players sit.
Hard disk drive is called player stand and RAM is called
cricket playground.
Now all my players are considered as our application which
we see on the screen.
Whatsapp, Instagram, Twitter, Youtube, Tinder, etc.
All these icons are visible on my screen.
Whatsapp.exe is visible on my hard disk drive.
Instagram.exe is visible on my hard disk drive.
Twitter.exe is also visible on my hard disk drive.
Youtube.exe and Tinder.exe are also visible on my hard disk
drive.
All these icons are visible on my hard disk drive.
RAM is cricket playground.
Whatsapp.exe is visible on my hard disk drive.
Instagram.exe is visible on my hard disk drive.
CPU is visible on my hard disk drive.
All these icons are visible on my hard disk drive.
CPU is visible on my hard disk drive.
All these icons are visible on my hard disk drive.
Whatsapp is visible on my hard disk drive.
All these icons are visible on my hard disk drive.
So when this input device will give input from the
keyboard, it will not give directly to any software.
It will first attach that thing to the input buffer here.
This is attached to your input device, the input buffer.
Things will be stored here.
Like I wrote Hi or I wrote Hello.
So where will Hello be stored?
It will be stored here in the input buffer.
After that, the application that will be inside my main
memory, it will pick up from the input buffer. After that,
it will have to show the output.
So where will it leave?
It will leave here in the output buffer.
The monitor in the output, where will it pick up things
from?
It will pick up things from the output buffer.
So I hope you have cleared all these things.
What is our CPU?
Let's see it again.
What are the things?
We will try to understand.
So what do I have here?
First of all, I know that if I download anything, where
does it go and store?
First of all, it is stored.
Like let's take the example of WhatsApp.
Now you can take both things.
On one side is the mobile phone, on the other side is mine.
On one side is mine, this is my PC.
Now I have to install the WhatsApp application on both of
these.
In the case of mobile, I will go to the Play Store.
In the case of PC, I will go to Chrome.
What did I write in Chrome?
I wrote WhatsApp in Chrome.
I have to download it.
Similarly, I wrote WhatsApp in the mobile phone.
I have to download it in the Play Store.
So I saw WhatsApp in the mobile phone.
In the Play Store, it is of 50 MB.
I saw WhatsApp on Chrome, it is of 100 MB.
So I clicked on Download.
Now after downloading, where will all the things come?
It will come in the storage.
The storage of the mobile phone, we call it a memory card.
And the storage of our computer, we call it a hard disk
drive or a solid state drive.
Is it so clear?
After that, when I downloaded it, I said what will I do?
I will install it.
What happens in installing?
There are two things while installing.
When you install, an icon is created.
Where do you see that icon?
You can see it on the screen.
And a file is attached to that icon.
Now think about it.
If you were not shown the icon and you were shown the name
of that file, that WhatsApp.exe, Instagram.exe, then how
many bad things would be visible on your screen?
So what did they do?
They gave an icon.
You like that icon.
You just care that if you want to run WhatsApp, then click
on the WhatsApp icon. We will handle the rest of the things
behind the scenes.
Which file to attach to it?
Which file to map with it? How to run it?
So what did I do?
When I installed it,
I saw the WhatsApp icon on the screen of my computer.
Similarly, when I installed WhatsApp on my mobile phone,
I saw the WhatsApp icon.
Now when I click on this icon, what does it mean?
Hard disk drive.
Or in the memory card, the file that I have stored, the
executable file, the file with 101, WhatsApp.exe, where
will it come from the hard disk to be run?
Now you understood the playground example, right?
What is there in my playground?
What is a playground? The RAM that I have, that is a
playground. And my stand, where things are kept, where the
players sit, what is that thing?
Hard disk drive.
So that means, as soon as I click on the icon, as soon as I
click on the icon, the file with WhatsApp.exe, where will
it come from the hard disk?
It will come to be run in the RAM.
When the file with WhatsApp.exe comes in the RAM, what will
happen after this?
After this, our CPU, or in the case of mobile, it is called
a processor.
It will read the things written in 101 line by line.
That all things are fine.
When all things are fine, it will open it on the mobile
screen or on the computer screen.
As soon as this whiteboard opens, when I clicked on the
whiteboard, what happened?
As soon as I clicked, the executable file will come from
the hard disk.
Where will it come from?
It will come to be run in the RAM.
After coming to be run in the RAM, what happened?
When it came to be run in the RAM, what did the CPU do?
It read the code line by line.
After that, when it felt that all things are fine, it
opened it and showed it to us. Now, whatever things I am
writing on it, how am I writing them?
With the help of the keyboard or mouse.
So what happened to the mouse?
The mouse became an input device.
Now, where do I see all these things?
I can see them.
What happened to this thing on my screen?
This has become your output device.
Do you understand this?
Now, let's see what we are talking about.
Notepad, means any application or any software has an
executable file. Let's search and see if it can be found in
the executable file.
So we went here, we put notepad. See, what is notepad?
This is the icon of notepad.
If you click on this icon, you will see things.
Let me pin it.
If it is pinned, let me pin it.
Where, where, where, where?
Pin to taskbar.
I have done it here.
Now, what do I see here?
I can see the icon here.
If I click on this icon, what happens?
As soon as I click on this icon, as soon as I click on this
icon, the .exe file, where would it have gone?
It would have gone into the RAM.
RAM? Now, how can I see the RAM in the computer?
Whether it has gone there or not?
So what you have to do is, you have to do window plus s,
you have to put taskbar here and enter it.
As soon as you put taskbar, one second, task, yes, it is
taskbar.
No, no, no, no, no, no, one second, one second, one second.
Here, you have to open taskmanager, not taskbar.
Taskmanager, we opened it and look here.
What do you see here?
You can see Google Chrome, you can see notepad, you can see
notepad, it means this is your RAM.
And what is this notepad in this?
It is .exe file.
Now, how can I find out this .exe file?
Let me show you.
Let's go and we put here window plus s and notepad, .exe.
I have put it.
Did anything come here?
Here comes notepad.exe.
If you want, you can run the icon directly.
Otherwise, if you run this file directly, what is going to
open?
Notepad is going to open.
Did something else open?
No, nothing else opened.
What opened?
Notepad opened.
So, we understood very well what is a computer's block
diagram.
Let's go back to it.
And we understood that in a computer's block diagram, there
are these components,
CPU, main memory.
Now, in every device, we saw that there are different
components.
There is a component called CPU.
There is a main memory.
I call main memory RAM.
There is a hard disk drive.
These are attached to each other.
There are input devices here.
I have output devices here.
So, one thing we read, let me show you.
What did we read?
We read something called integrated.
Now, where is it?
What is written here?
A computer includes various devices.
What are these various devices?
These are your CPU, your main memory, your hard disk drive,
your output device, and your input device.
Now, what do they do?
Let's go back to it.
So, we saw that what is this? Various divided function as
an integrated system.
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In next lecture.
Till then you have to practice.
Till then I want to prepare another lecture.
Till then good bye.
Thank you for watching.