Operating systems › DOS (MS-DOS / DR-DOS) › MS-DOS 6.22
MS-DOS 6.22
1994
The 1994 final standalone MS-DOS, bundling DoubleSpace/DriveSpace disk compression, defragmentation and antivirus tools.
Machines
Chips
Reference & documentation
External technical references for programming MS-DOS and for writing PC/DOS emulators.
| Resource | Type | Notes |
|---|---|---|
| Microsoft FAT File System Specification (fatgen103) ↗ | Format | Official Microsoft FAT12/16/32 filesystem spec |
| Microsoft FAT Specification ↗ | Format | Primary Microsoft FAT spec v1.03 (PDF) |
| FAT Filesystem (OSDev Wiki) ↗ | Format | FAT12/16/32 layout, BPB, directory entries |
| DOS MZ executable format (Kaitai Struct) ↗ | Format | MZ EXE header, field-by-field binary spec |
| MZ .EXE Executable (OSDev Wiki) ↗ | Format | DOS .EXE header and relocation table |
| Ralf Brown's Interrupt List (HTML) ↗ | Interrupt list | 9000+ pages; every documented & undocumented INT |
| Ralf Brown's Interrupt List (master files) ↗ | Interrupt list | Author's canonical release downloads |
| PC Memory Layout and Memory Map ↗ | Memory map | Conventional, UMA, HMA address ranges tabulated |
| x86 Memory Map (OSDev Wiki) ↗ | Memory map | Real-mode conventional/upper memory, IVT, BDA |
| The Art of Assembly Language (DOS/16-bit edition) ↗ | Programming | Classic real-mode x86 assembly programming text |
| 16-Bit DOS Programming (Irvine, Ch.13) ↗ | Programming | INT 21h/10h assembly tutorial (PDF) |
| WinWorldPC - MS-DOS 6.22 ↗ | ROMs | Install floppy / VHD images, all localisations |
| FreeDOS Project ↗ | ROMs | Open-source DOS: source, compilers, downloads |
| MS-DOS 6.22 Disk Images (Internet Archive) ↗ | ROMs | Bootable 1.44MB install floppy .img files |
| HelpPC: INT 21 DOS Function Dispatcher ↗ | Reference | Quick INT 21h function-by-function lookup table |
| List of undocumented DOS functions ↗ | Reference | Undocumented INT 21h calls and internal tables |
| MS-DOS Encyclopedia (Ray Duncan) ↗ | Reference | Browsable 1988 classic: calls, TSRs, interrupts |
| OS/2 Museum - DOS Internals ↗ | Reference | Deep articles: A20, HMA, TSR, internals |
| Microsoft MS-DOS Source Code ↗ | Source | Official asm sources for v1.25, 2.0, 4.0 |