Ever clicked an icon and wondered how your program starts? Meet the Loader Module, the unsung hero in your operating system! This video breaks down how it loads programs from your disk to RAM, sets up processes, and gets your apps ready to roll. Perfect for tech newbies or curious coders! Join us for a fun, easy-to-follow explanation, and stick around for more OS secrets. Subscribe, comment your thoughts, and scan the QR code to explore more tutorials on our site! Let’s geek out together!

Introduction to Loader Module 00:00:00
What is the Loader Module 00:00:10
Role in Operating Systems 00:00:14
Loading Process Overview 00:00:21
Program Execution Trigger 00:00:44
Signal to Operating System 00:01:00
Executable Validation 00:01:43
Memory Allocation 00:02:31
Process Creation 00:03:05
Process Setup Completion 00:04:22
Operating System Scheduling 00:04:54
Multitasking Illusion 00:05:24
Process Termination 00:05:59
Loader Module Limitations 00:06:11
Conclusion and Summary 00:06:28
Call to Subscribe 00:07:00
Website and Community 00:07:56

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Hey there! Let’s talk about the Loader Module for just a second.

What is the Loader Module? For starters, you probably have one on your computer at home.

Almost, I mean, as far as I understand, every major operating system has a Loader Module.

I would be surprised if an operating system did not have one.

The Loader Module is basically responsible for getting your program loaded from your hard disk,

your hard disk your ssd or whatever into ram and sort of setting it up setting up an empty process

and getting it all prepared so that the operating system can begin executing your process doesn’t

actually execute it it just gets it set up so i mean think about it what if i click on my desktop

here and i click on this little mouse icon this little text editor icon the mouse pad

it launched what happened it wasn’t running before and now it is running something had to do that

It wasn’t the desktop environment actually the desktop environment when I click this little button

It just sent a signal to the operating system letting it know that I wanted to start executing a program

But it didn’t actually load it up for me. That’s the loader module. The loader module is part of the operating system

and imagine that as soon as I

You know click this button right here a signal gets sent to the operating system or maybe even if I just execute a command like echo

You know test or something or run get get status. Let’s say

status let’s say or even I could run this terminal again terminator and it

shows up in another window something like that let me exit from that you know

anything that I exit whatever the loader module is involved so I click this and

the first thing that will happen is the loader module will inspect the

executable which is just kind of sitting on disk somewhere and it’ll make sure

that it’s actually executable it’ll make sure not just in terms of you know

That’s sort of an operating system thing, a different part of the operating system.

But it’ll check to make sure, let’s say that it’s a binary program that needs to be executed.

It’ll make sure that the data inside of the binary, the actual executable is correct for

the current system that you’re on.

Like right now I’m on Linux 64 bit.

So it’ll make sure that the executable is in a ELF 64 format or a format that can be

executed.

It’ll check that it’ll make sure everything’s okay to make sure it’s got some data. It’s got like a you know an entry point whatever

If everything looks good, then it will go through system RAM and try to find a little place in RAM that’s unoccupied

I’m not going to talk too much about operating system concepts beyond the loader module, but just so you know

There is a paging system that it would go through which sort of lets you have fragmented memory without too much of a penalty

the ram stick directly but for our purposes we’ll just say it’s looking for a free spot in memory

anyway once it finds out that there’s a free spot in memory that’s big enough to accommodate

the program then it actually loads the program from disk from ssd from whatever into that spot

in memory and creates a process in the operating system remember everything that’s actually running

in your operating system is a process there’s a process for this notepad there’s a process

for the mouse stuff there’s a process for this little widget down here there’s a

process for the entire desktop there’s a process for probably every tab in your

browser you know a process just means here’s a little spot in memory on the

computer and it’s got a program inside of it and it wants to be run by the CPU

whenever the CPU thinks that it has some time to run that process so that’s like

a process anyway so it you know it finds a spot in memory it loads the program in

you know checks everything it sets it up as a process which means it has to set up some data

structures in the operating system indicating hey there’s a new process in town and here’s where the

memory is and here’s the first instruction that you should execute and it just kind of sets

everything up so that it’s like a like a ready process a process in the ready state that hasn’t

been actually executed yet but it’s ready to get executed so once it does all of that

new process you know setting everything up maybe figuring out what is the virtual memory address

that the process is going to see and so forth then finally it lets the operating system know

that the process is ready to run so before it was just kind of like loading it and setting it up

marking little flags figuring out the virtual memory offset all that stuff then once that’s

all finished it just tells the operating system now this process is ready to run the process

I’m going to try my best not to talk too much about operating systems concepts beyond the loader module, but

the loader module’s job is not to run the process. It’s just to load it, just to set it up.

At some later point in time, maybe some amount of microseconds or milliseconds in the future,

the operating system will decide, okay, now I’m ready to let that program run for a little while.

Since the process has already been set up by the loader module, the operating system knows where

it is in memory and it knows the next instruction address or offset address to execute. It’ll just

set address to execute it’ll just start bringing those instructions onto the CPU and just execute

them for some amount of time and then the operating system will decide to stop and take it off the CPU

again you know put it back just into a into a ready state and then it just keeps switching back

and forth between that by the way have you ever wondered how it is that maybe your CPU only has

one core or only eight cores but there are hundreds of browser tabs that you have open

hundreds and hundreds of processes that you have open that’s how the operating system does it it

it simulates it provides the illusion that all these programs are running at the same time so

this notepad process right here it’s not actually running at all times it just runs in tiny little

slices again i’ll try to stay away from explaining that too much because i’m really here to talk

about the loader module another thing to keep in mind is that eventually when your process terminates

like the the program terminates itself or the operating system kills it for some reason or just

or just, you know, something happens to where it’s just not going to be running anymore.

It’s not the loader module that has anything to do with that.

And there is no unloader module.

It will just mark itself as, you know, I’m done, I’m terminated, whatever,

or it’ll get marked.

Then the operating system will come along and clean it up.

So loader module is not involved in that step.

It’s just involved in getting everything set up so that it can start to execute.

And that’s the basic idea.

detailed but that’s what the loader module does in general and you probably

have a loader module on your operating system right now unless you’re running

some bizarre operating system that has some other strange method of doing

things okay that’s all I really wanted to say in this video thank you so much

for watching I hope you learned a little bit of stuff and had some fun I’ll see

you in the next video

Thanks for watching this video again from the bottom of my heart. I really appreciate it

I do hope you did learn something and have some fun

If you could do me a please a small little favor

Could you please subscribe and follow this channel or these videos or whatever it is you do on the current social media?

It’s a website that you’re looking at right now

It would really mean the world to me and it’ll help make more videos and grow this community

So we’ll be able to do more videos longer videos better videos or just I’ll be able to keep making videos in general

videos in general. So please do me a kindness and subscribe. You know, sometimes I’m sleeping

in the middle of the night and I just wake up because I know somebody subscribed or followed.

It just wakes me up and I get filled with joy. That’s exactly what happens every single time.

So you could do it as a nice favor to me or you could troll me if you want to just wake me up in

the middle of the night, just subscribe and then I’ll just wake up. I promise that’s what’ll happen.

Also, if you look at the middle of the screen right now, you should see a QR code, which you

QR code which you can scan in order to go to the website which I think is also

named somewhere at the bottom of this video and it’ll take you to my main

website where you can just kind of like see all the videos I published and the

services and tutorials and things that I offer and all that good stuff and if

you have a suggestion for clarifications or errata or just future videos that you

want to see please leave a comment or if you just want to say hey what’s up

you know just send me a comment whatever i also wake up for those in the middle of the night i get

i wake up in a cold sweat and i’m like it would really it really mean the world to me i would

really appreciate it so again thank you so much for watching this video and um enjoy the cool music

as as i fade into the darkness which is coming for us all

Thank you.

The post How the Loader Module Works: Launching Programs in Your Operating System Explained! appeared first on NeuralLantern.com.

Hey there! Struggling with binary to hex conversions? This video makes it SUPER easy—no math required! Learn to convert between binary and hexadecimal with simple patterns you’ll memorize in no time. Perfect for computer science students, coders, or anyone curious about how computers work. Subscribe for more tutorials, and scan the QR code to visit my site for extra resources. Drop a comment with your questions or video ideas! #Binary #Hex #ComputerScience #Coding

Introduction to Binary and Hex Conversion 00:00:00
Why Convert Between Binary and Hex 00:00:13
Recap of Number Systems 00:00:41
Binary Base Two System 00:01:01
Hexadecimal Base Sixteen System 00:01:24
Benefits of Hexadecimal 00:02:06
Simplifying Binary-Hex Conversion 00:03:04
Four Bits Equal One Hex Digit 00:04:32
Memorizing Binary-Hex Patterns 00:05:13
Creating a Binary-Hex Conversion Table 00:06:26
Converting Hex to Binary Example 00:08:52
Understanding Nibbles and Bytes 00:10:44
Converting Binary to Hex Example 00:13:19
Conclusion and Verification 00:15:38
Call to Subscribe and Engage 00:16:20

Thanks for watching!

Find us on other social media here:

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Please help support us!

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Hi there! Let’s talk about converting back and forth between binary and hexadecimal.

Why would you want to do that? Well, maybe you’re in computer science. Maybe you’ve been presented

with some numbers that you need to convert. Maybe you have like a bunch of ones and zeros.

Maybe you have like an ox and then something that looks really weird. It’s got some letters in it,

but it’s also got some numbers. And you’re trying to figure out what are these? What are we trying

we try to convert back and forth between.

You should have watched my other videos by now,

which will teach you how to convert back and forth

between both of these number bases and decimal.

So you can understand what they are

in just normal human terms.

But as a quick recap, decimal is a base 10 number system

because we have 10 possible characters that we can use.

We can say zero, one, two, three, four,

five, six, seven, eight, nine.

So that’s 10 total characters, zero through nine.

We also have binary, which is what computers use, which is a base two system.

It’s base two because the only characters you have available are just zero and one.

So base two, two characters.

You can represent a number between zero and one in a single digit.

Then we have hexadecimal, which is a way to represent a number in a more compact way.

system there because we have 16 possible characters we have 0 1 2 3 4 5 6 7 8 9

just like decimal but then we add more numbers we had like six numbers we say

a b c d e f and what happens is the a has a strength of 10 whereas the you know

the 9 just to its left had a strength of 9 the a has a strength of 10 the b has a

of 11 the c has a strength of 12 and the d has a strength of 13 and the e has a strength of 14

and the f has a strength of 15 and so you know we just have more characters that we can use in one

single digit which means we can rent we can represent the same number in decimal but just

we can represent it smaller if we use hexadecimal so it’s kind of useful when you’re working with

looking at bits in binary or hex and not necessarily decimal because binary as

you’re going to learn in this video gives you kind of a good idea just by

looking at it after you’ve practiced a little while gives you a good idea of

what hex numbers you would be seeing if you were looking at the same number and

vice versa if you’re looking at hex numbers if you look at them a lot in

your daily life you’ll start to kind of like see through the matrix and you’ll

And if you’re interested in finding what bits are on and off,

it’s convenient to be able to look at a hexadecimal number

and kind of intuitively know,

okay, those bits are probably like on and off.

Those bits are all on, you know, whatever.

So this is the basics of number basis.

Here’s a trick.

In all my other videos,

when we converted back and forth

between decimal and binary and hex and all that stuff,

we used multiplication, we used division,

you know, we messed with the numbers quite a bit.

the great thing about binary and hex conversions is you don’t even really need to do math.

Maybe a little math at first while you’re learning, but eventually when you get used to it,

you start to realize you can memorize short patterns. Let me bring your attention to the

fact that in hexadecimal, you have 16 possible combinations, or you can represent a number

you can do the same thing in four characters if I had four characters right

here in binary very quickly you could do the calculation in your head if you’ve

watched my other videos you can see well that one counts for a one and this one

counts for a two and this one counts for a four and this one counts for an eight

if I want to know what the maximum value is that I could represent with four

digits I just take the the top numbers strength multiply it by two and then

strength multiply it by 2 and then subtract 1. So if we have 1, 2, 4, 8, I’ll just multiply 8 by 2,

that’s 16, and then subtract 1, that’s 15. So I can represent a number between 0 and 15 with 4

binary digits. But I just said you could do that with one hexadecimal digit, right?

So that means one hexadecimal digit is actually four binary digits. And if you just memorize

16 combinations of numbers, which is not like that hard.

And even if you don’t memorize them all,

I don’t have them all memorized.

It’s really easy to convert in your head

a four digit binary number to decimal

and then convert that back to hexadecimal pretty fast,

hexadecimal.

So what’s the equivalent of 1111?

Well, we know it’s the highest possible value

with just one hexadecimal digit.

So that would have to be an F.

So you can memorize already

You can memorize already a couple of really, really easy combinations.

We could say, let me say zero binary, OB to say that we’re looking at binary is equal

to zero X F. So just the letter F in hex.

Remember that we like to prefix different base number systems to give the reader a reminder

of what base they’re looking at.

one i’m going to say that 000 in binary is just zero in hex if i didn’t put that prefix how would

you know if you’re looking at hex or binary or decimal it would be even more confusing if you

had like you know one two zero is that hex one two zero or is that uh decimal one two zero i guess it

can’t be binary one two zero but if we did one one zero now it could be binary or hex or decimal so

i’m just going to put uh zero b for binary and i’m going to say it’s zero so that’s two of the

of the 16 total possible combinations that we would memorize.

So let’s iterate through all the combinations.

Just for the sake of making this table more compact,

actually, let me start a new little notepad page here.

I’m going to omit those prefixes because those are a good idea,

but while we’re doing our lookups, they’re a little irritating.

So I’m going to take them out.

So I’m going to say 0001.

Let me say this.

So I’m just going to count from 0 to 15 in binary.

to 15 in binary.

So this is going to be one, one,

and then zero and then zero, one, zero, one, zero, one,

I don’t know, that’s a lot of copy pasting.

Let me just double check here that I’m doing this right.

I should have 16 lines.

I don’t, so I’ve done something wrong.

Let’s see.

So this is like 0, 1, 2, 3, and this is 4.

This is 5, and then 6, and then 7, and this is 8.

Oh, I have that twice.

Okay, 8.

And then since I copy pasted the bottom part,

I think I can probably assume that’s okay.

One, two, three, four, five, six, seven.

That was kind of spooky.

I guess a lesson learned is that relying on a battery pack

or a light that’s gonna stay on for many hours

is probably a dumb idea.

Anyway, continuing, we have this table here.

We have like 16 possible combinations.

So now I’m gonna map these to hexadecimal digits.

uh you know like 10 are going to be really easy right it’s just going to be zero and then one

and then two you can make a vertical table if you want for yourself I’m just doing it this way

because it’s easier the way that I’m typing in this notepad the way that I’m typing in this

notepad so I’m going to do seven eight nine and then when we get to 10 let me just double check

10. So this is eight plus two. So that means this is indeed a 10 and oh, 10 in hex, not a decimal.

So that’s a and then B and then C and then D and then E and then F. Okay. So now that we have this

little table set up, you know, if you want to write it horizontally, that’s fine. It’s actually

binary and hex now imagine we have a gigantic hex number zero x and then i’m just going to do like a

bunch of numbers and then i’m going to do change some of these to like letters just to make things

more interesting a b c d e did i use any d e f e b i didn’t use a b oh there we go and i’ll put like

another aid in there okay so this is huge and this would take like a while to calculate right

to calculate right if you were going to convert it to decimal for hex to binary conversion it’s

actually pretty easy you literally just go b what is b b is that so b is just that you don’t even

have to do any math let me copy paste this down here so i can show you a really easy way to do

D is this right here.

So I’m going to say the D is that.

And then the 6 is that pattern right there.

So move you over.

1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4.

Maybe that’ll line up later, hopefully.

So the 1 is pretty easy.

Probably didn’t even need to copy-paste that.

I could have just looked at it and typed.

looked at it and typed the E is going to be that and the seven is going to be that

and the two is going to be this eight see what I’m doing I’m literally just

copy pasting the bit patterns if you don’t have copy paste when you’re doing your conversion

that’s okay you can at least write down zeros and ones really fast if it’s just

you know four at a time I should also point out that um you know this is pretty important to

good term that people like to use. Four bytes or one hexadecimal digit, it’s called a nibble.

So usually you’re used to seeing eight bytes in a row and you call that, sorry,

usually you’re used to seeing eight bits in a row and you call that a byte or two hex digits in a

row and you call that a byte. If you just see four bits or one hex digit, that’s a nibble.

Two nibbles make a byte. Try to remember that. So we have this giant thing here.

we have literally now successfully converted binary.

I’m going to put, I’m just going to put OB here

and then remove all the spaces.

This is the binary number that we originally had

in hexadecimal.

So again, just to emphasize, these are the two same numbers.

They’re just represented differently.

Differently.

Let me punch this into my personal calculator

to make sure that I gave you the right walkthrough

so I don’t have to correct in a video later.

so expression X result binary oh god I can’t even I can’t even read that okay

so let me let me do it backwards I’m gonna copy paste this one in there okay

so let’s see X okay so it’s telling me that supposed to get to B and then a D6

728fac. Okay, so I did it. And this is also a good reminder that you kind of want to pair off

into groups of one byte at least. So, you know, each two characters, that’s one byte. One character

by itself is a nibble. So you want to pair off into bytes. And notice how this b is all by itself.

So you want to pad to the left with a zero so that you’re just kind of working with bytes.

It’s easier on the eyes and the brain. And you’ll usually see something like this

output from a program or something. In fact, you might see something like this representing,

here’s a word, or you might see something like this showing that this is like a D word or,

you know, like a 32 bit number. And if we wanted to say, oh, this is a 64 bit system. So let’s

look at 64 bits. Let’s look at eight bytes. Then we’ll just like pad it with, let’s see, one, two,

that’s one, two, three, we’ll pad it with a bunch more zeros. One, two, three, four, five, six,

So this is a proper 64-bit number or an 8-byte number that works with modern systems,

whether you have the space in there or not.

And so I’m not going to do another example from hex to binary.

Let’s do a quick example from binary to hex.

It should be just as easy.

So I’m going to start a new tab here and just copy-paste the table that I made.

Let’s make a bunch of random numbers for binary.

And so now we’ve got like a bunch of numbers.

All we have to do is I’m going to copy paste this so I don’t ruin the original thing that

I wrote down.

And I’m just going to break it up into groups of four, starting from the least powerful

digits, you know, like all the way on the right.

So I’m going to go doop, doop.

Okay.

So after breaking it into groups of four, you can see that the, you know, the most powerful

digit there is a one all by its lonesome.

I could put 000 to make sure that they’re all groups of four bits. I don’t really have to because

I could still kind of understand just by looking at the one that it’s going to end up being a one

and then literally just translate it the same way I did before. Okay that’s a 1.

1 0 1 0 that’s an A. What’s a thousand and one? It is a nine. What’s a 0 100?

what’s one oh one oh a what’s a thousand and one didn’t i just do that that’s a nine

what’s a zero zero oh ten that’s going to be a two for sure yeah two i finally got one off the

top of my head one zero one one that’s a b and then uh basically 15 minus eight i don’t really

want to work that out of my head right now so i’m gonna look at the table seven okay i guess i

should have done that easy right like how fast was that so i’m just going to copy paste these

put an ox in front of it and maybe bunch them into groups of two first to see what’s up

okay so they’re not in groups of two that means this one is kind of i should have started grouping

them on the right side kind of messed it up someone just you know rearrange the grouping

Let me punch this into my personal calculator to make sure that I got this right. Actually, let me do this original number here

I must say

This binary number is supposed to be

1 a 9 4 a 9 2 b 7. Okay, we did it

Really easy, right? So every time you have to convert back and forth between binary and hex

It’s your lucky day because that’s like one of the easiest conversions you could do

Thanks for watching this video. I hope you learned a little bit of stuff and had some fun

I’ll see you in the next video.

So we’ll be able to do more videos longer videos better videos or just I’ll be able to keep making videos in general

So please do do me a kindness and and subscribe

You know sometimes I’m sleeping in the middle of the night

And I just wake up because I know somebody subscribed or followed it just wakes me up and I get filled with joy

That’s exactly what happens every single time

So you could do it as a nice favor to me or you could you control me if you want to just wake me up in the middle

And I just subscribe and then I’ll just wake up. I promise that’s what will happen

that’s what will happen also uh if you look at the middle of the screen right now you should see a

qr code which you can scan in order to go to the website which i think is also named somewhere at

the bottom of this video and it’ll take you to my main website where you can just kind of like see

all the videos i published and the services and tutorials and things that i offer and all that

good stuff and uh if you have a suggestion for uh uh clarifications or errata or just future videos

future videos that you want to see please leave a comment or if you just want to say hey what’s up

what’s going on you know just send me a comment whatever i also wake up for those in the middle

of the night i get i wake up in a cold sweat and i’m like it would really it really mean the world

to me i would really appreciate it so again thank you so much for watching this video and um enjoy

the cool music as as i fade into the darkness which is coming for us all

Thank you.

The post Binary to Hex Conversion Made EASY! No Math Needed! appeared first on NeuralLantern.com.