# Device Drivers

ModuOS includes drivers for essential hardware components.

## Driver Architecture

```
┌────────────────────────────────────────┐
│        Kernel Subsystems               │
└────────────┬───────────────────────────┘
             │
┌────────────▼───────────────────────────┐
│        Device Drivers                  │
│  ┌──────────┐  ┌──────────┐            │
│  │ Storage  │  │ Graphics │            │
│  │ ATA/AHCI │  │   VGA    │            │
│  └────┬─────┘  └────┬─────┘            │
│  ┌────▼─────┐  ┌────▼─────┐            │
│  │  Input   │  │  System  │            │
│  │   PS/2   │  │ PCI/ACPI │            │
│  └──────────┘  └──────────┘            │
└────────────┬───────────────────────────┘
             │
      Hardware Access
```

## Driver Categories

### Storage Drivers
- **ATA/ATAPI**: IDE drives and CD-ROMs
- **AHCI/SATA**: Modern SATA controllers
- **vDrive**: Virtual drive abstraction

### Graphics Drivers
- **VGA**: Text mode (80x25)
- **SQRM GPU modules**: Framebuffer graphics drivers (examples: QXL, VMSVGA, MD VGA Compatible Display Driver)

### Input Drivers
- **PS/2**: Keyboard and mouse
- **USB**: HID devices (WIP)

### System Drivers
- **PCI**: Device enumeration
- **ACPI**: Power management
- **RTC**: Real-time clock

## Next Steps

- [Driver API](Driver-API.md) - includes SQRM third‑party module SDK
- [Storage Drivers](Storage-Drivers.md) - Disk access
- [PCI Subsystem](PCI-Subsystem.md) - Device discovery