turbanOS

A minimal 32-bit x86 operating system with keyboard input, VGA text output, and a simple interactive terminal.

fetch command

show date and time

list of commands

Features

• Bootloader compliant: Uses Multiboot standard for compatibility with GRUB and other bootloaders
• Hardware interaction: PS/2 keyboard driver with interrupt handling
• Text output: VGA 80x25 text mode with scrolling and cursor support
• Terminal interface: Interactive command-line with basic commands
• Memory management: Stack allocation and interrupt descriptor table setup
• PIC remapping: Properly configures the Programmable Interrupt Controller

Commands

• help - Display available commands
• clear - Clear the terminal screen
• fetch - Simple echo test
• time - Show current time
• date - Show current date
• reboot - Display system information

Project Structure

• boot.asm - Assembly boot code and interrupt setup
• kernel.c - Main kernel with terminal, keyboard, and VGA drivers
• link.ld - Linker script for kernel memory layout

Building

Requires NASM, GCC, QEMU VM and a cross-compiler toolchain for i386. The kernel is loaded at 1MB and follows standard Multiboot conventions. I recommend that you use microsoft WSL for compilation. For WSL:

nasm -f elf32 boot.asm -o boot.o && gcc -m32 -ffreestanding -nostdlib -fno-stack-protector -c kernel.c -o kernel.o && ld -m elf_i386 -T link.ld -o kernel.bin boot.o kernel.o && qemu-system-i386 -kernel kernel.bin

Purpose

Educational project demonstrating basic operating system concepts: boot process, hardware interaction, keyboard driver, and user interface implementation.