IBM’s DOS Line
IBM PC‑DOS was IBM’s branded version of DOS for the original IBM PC and its successors. While closely related to MS‑DOS, PC‑DOS had its own versioning, licensing, and some unique utilities.
\PC‑DOS vs MS‑DOS
Although PC‑DOS and MS‑DOS shared a common code base, OEM customizations and IBM‑specific features make PC‑DOS an important branch in DOS history.
Related pages
Versions Included
- PC‑DOS 1.0 — IBM’s first release, based on Microsoft’s DOS 1.0.
- PC‑DOS 1.1 — Minor improvements and OEM adjustments.
- PC‑DOS 2.0 — Introduced subdirectories and hard disk support.
- PC‑DOS 2.1 — Update for IBM PCjr and other systems.
- PC‑DOS 3.0 — Support for larger disks and new formats.
- PC‑DOS 3.1 — Networking enhancements.
- PC‑DOS 3.2 — Added 3.5″ floppy support.
- PC‑DOS 3.3 — One of the most widely used DOS versions of the 1980s.
- PC‑DOS 4.0 — Added graphical shell and larger partition support.
- PC‑DOS 4.01 — Stability improvements.
- PC‑DOS 5.0 — IBM’s version of MS‑DOS 5.0 with similar features.
- PC‑DOS 6.1 — IBM’s equivalent to MS‑DOS 6.x with added utilities.
- PC‑DOS 7.0 — Major update with REXX scripting and improved tools.
- PC‑DOS 7.1 — Added FAT32 support; released only with OEM recovery media.
Official IBM / Microsoft Download
No official downloads for IBM PC‑DOS are provided by IBM or Microsoft.
IBM discontinued public distribution of PC‑DOS, and no legal disk images or installers are available from official sources.
Historical Notes
IBM PC‑DOS was IBM’s branded version of Microsoft’s DOS, customized for IBM hardware. Early versions (1.x–3.x) were nearly identical to MS‑DOS, while later versions diverged as IBM added unique features such as REXX scripting and enhanced utilities.
PC‑DOS 7.0 and 7.1 represent the final evolution of IBM’s DOS line, with 7.1 adding FAT32 support. After this period, IBM ended development as the industry transitioned to Windows and OS/2.