Hello everyone! This is the 9th article of my ‘Make you own Operating System” article series. In this article, I will talk about how to run a simple program in user mode. User Mode User mode is now almost within our reach, there are just a few more steps required to get…

Hello everyone! This is the 8th article of my ‘Make you own Operating System” article series. In this article, I will talk about page frame allocation. Page Frame Allocation When using virtual memory, how does the OS know which parts of memory are free to use? …

Hello everyone! This is the 7th article of my ‘Make you own Operating System” article series. In this article, I will talk about how to enable virtual memory through paging. What is Virtual Memory? Virtual memory is an abstraction of physical memory. The purpose of virtual memory is generally to simplify application development and…

Hello everyone! Now that the kernel boots, prints to screen, and reads from the keyboard. what else we can do from our OS? This article will show how to easily execute a small program in kernel mode. Kernel mode Usually, a kernel is not supposed to do the application logic itself, but…

Hello everyone! Now our primitive OS can produce output. So it would be nice if it also could get some input. The operating system must be able to handle interrupts to read information from the keyboard. An interrupt occurs when a hardware device, such as the keyboard, the serial port…

Hello everyone! In this article, I will talk about integrate segmentation. Segmentation is a Memory Management technique in which memory is divided into variable-sized chunks allocated to processes. Each chunk is called a segment. A table stores the information about all such segments. To address a byte in segmented memory…

Hello everyone! This article will explain the steps to display text on the console as well as writing data to the serial port. …

A software license is a legal document that governs how the software can be used and distributed. Under copyright laws, all software is protected. A typical license grants a user permission to use one or more copies of the software without infringement of copyright. Software license falls into two broad…

Imagine that you designed an app for youngsters to make videos. You prototyped your initial design and implemented the core functionality. how would you find out whether it would appeal to them and whether they will use it? you would need to evaluate it — but how? …