Operating systems › DOS (MS-DOS / DR-DOS) › DR-DOS 5.0
DR-DOS 5.0
1990
Digital Research's 1990 MS-DOS-compatible rival, notable for high-memory usage, a full-screen editor and disk caching that pressured Microsoft.
Machines
Chips
Reference & documentation
External technical references for programming DR-DOS 5.0 and for writing emulators.
| Resource | Type | Notes |
|---|---|---|
| DOS MZ executable format (Kaitai Struct) ↗ | Format | MZ EXE header, field-by-field binary spec |
| Ralf Brown's Interrupt List (browsable HTML) ↗ | Interrupt list | Definitive x86/DOS interrupt & API reference |
| DOS API (INT 21h) reference ↗ | Programming | INT 21h function table shared across DOS variants |
| WinWorld: DR DOS 5.x ↗ | ROMs | DR DOS 5.0 disk images, multiple OEM/language releases |
| DR DOS 5.0 Highscreen OEM (raw floppy dumps) ↗ | ROMs | Raw IMG and KryoFlux dumps of original floppies |
| DR DOS 5.0 User Guide & Supplementary Materials ↗ | Reference | Original DR DOS 5.0 manuals and quick reference card |
| Enhanced DR-DOS (EDR) Kernel Source ↗ | Source | DR-DOS kernel + COMMAND.COM source, JWasm/OpenWatcom |
| OpenDOS / DR-DOS 7.01 Enhancement Project ↗ | Source | Caldera OpenDOS source patches, build tools, binaries |