BIOS Text Editor (Two-Stage Bootloader)

A minimal two-stage boot sector program written in x86 assembly that implements a bare-metal text editor.
The editor supports typing, saving, and loading text directly from video memory — running entirely without an operating system.

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✨ Features

• Two-stage bootloader
  • Stage 1 fits within the 512-byte MBR limit
  • Loads Stage 2 into memory to enable editor functionality
• Text editor
  • Character input with real-time screen updates
  • Save and load text buffers from video memory
• Low-level system design
  • Direct manipulation of VGA text mode memory
  • BIOS interrupt handling
  • Demonstrates bare-metal control transfer between boot stages

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🛠️ Requirements

• An x86 emulator such as:
  • QEMU
  • Bochs
  • Or real hardware (bootable image on USB)
• nasm assembler to build the project

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🚀 Build & Run

Build

nasm -f bin stage1.asm -o stage1.bin
nasm -f bin stage2.asm -o stage2.bin
cat stage1.bin stage2.bin > editor.img
qemu-system-i386 -fda editor.img