sudo dd if=LetaOS.flp of=/dev/sdb
```



**NOTE:** Format your USB drive. Try not to partition your pen drive and make it as LetaOS only USB drive.



```
sudo /sbin/mkdosfs -F 32 -I /dev/sdb`
```



On linux, use the dd utility like this:


```
sudo dd if=LetaOS.flp of=/dev/fd0
```



####*Using Emulator:*

If you want to quickly try out “Leta OS” you can use an emulator/virtual thing to experience Leta OS. That doesn’t involve writing disk images to a physical device.

- QEMU- https://www.qemu.org (This is what i recommend to try in both Linux and windows)
- NASM- Nasm is a assmbler that compiles assembly language code into machine language. Download these two tools into your linux machine to work with Leta OS

👏NASM & QEMU installation on linux:(both will be installed at once)


```
sudo apt-get install build-essential qemu nasm
```



👏Next: Open Leta OS folder and open that location in the terminal and compile Leta OS like this and it will be built,


```
sudo bash ./build-linux.sh
```



👏Running:After building LetaOS type this command in that same location on the terminal , OS will be turned on in qemu emulator:


```
qemu-system-i386 -soundhw pcspk -drive 
format=raw,file=disk_images/LetaOS.flp,index=0,if=floppy
```



###**This is how “Leta OS” looks like**:

![Welcome Screen of LetaOS](https://thepracticaldev.s3.amazonaws.com/i/170pcgr2vwf34y8nb54v.png)

![Second Screen/Window to select Hardware info option of LetaOS](https://thepracticaldev.s3.amazonaws.com/i/93cy8w7uz3uyaschs0hp.png)

![Hardware Information Display on Leta OS](https://thepracticaldev.s3.amazonaws.com/i/xfrbn934n1u3vfqs3mqe.png)

###**Leta OS:**

There are some special parts of my LetaOS code.

1- Created three separate windows with basic Assembly.

(Draw backgrounds, option screens are coded with text contents ,dialog boxes, created buttons to perform something once it clicked, made color variations and designed UI with three separate windows)
- kernal.asm
- screen.asm

2- Shut down method/Turn off OS once you click shut down button.

![Shut Down](https://thepracticaldev.s3.amazonaws.com/i/1in7jhdey3jvec4jtqf6.png)

3- Used BIOS service interrupts/processor and hardware interrupts to display hardware information.

- BIOS Interrupts
- CPU Interrupts
- Number Of Hard Drives
- Reading base memory
- Display all the Hardware information in one screen

**Hardware interrupts **are used by devices to communicate that they require attention from the Operating System. They are implemented using electronic alerting signals that are sent to the processor from an external device, which is either a part of the computer itself. They have a direct line to the processor through an interrupt request line.

![iNTERRUPTS](https://thepracticaldev.s3.amazonaws.com/i/ei89m59xojqb4jkm0t8z.png)


4- Enabled keyboard inputs such as **ENTER, ESC, ARROWKEY** inputs to perform click, back and move between buttons.

###**Thank You**

*Hope you all enjoyed and learned something on this. Please let me know your comments suggestions and any questions you have about this blog.*

👉 Visit me - [https://mihinduranasinghe.com/](https://mihinduranasinghe.com/)