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https://github.com/gbowne1/ClassicOS.git
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Gregory Bowne
bcd09a898c
Implement parallel port support with detection and configuration. Add LPT port handling in parallel.c Implement LPT port detection and configuration functions.
ClassicOS
ClassicOS is a 32-bit Intel x86 operating system built from scratch using C, NASM, and GCC. Designed for 386, 486, and Pentium-class CPUs, it runs in protected mode, outputs to VGA text mode and serial ports, and supports floppy/HDD boot with basic FAT support.
✨ Features
- MBR bootloader at
0x7C00 - Switch to protected mode with GDT
- A20 gate enabling
- Simple FAT12/FAT16 disk loader stub
- VGA text output (
0xB8000) - Serial COM1 support (
0x3F8) - Basic kernel (
kmain) written in C - Makefile-based build system
- Bootable floppy image for testing in QEMU
⚙️ Requirements
You’ll need the following tools installed:
nasmgcc(targeting i386)ldmakeqemu-system-i386
Optional:
gdbvncviewer(TigerVNC or similar)
🛠️ Building ClassicOS
Clone repository:
git clone https://github.com/gbowne1/ClassicOS.git
cd ClassicOS
Run configure script to build a cross-compiler toolchain for i386-elf:
./configure
Source the .build.env file to add the cross-compiler toolchain to your PATH:
source .build.env
Build the kernel:
make