Condition: Used – Tested / Good Condition
Version: 3.21 (OEM update patch of DOS 3.x era)
Platform: IBM PC and compatibles (IBM PC/XT/AT era)
Up for listing is a genuine IBM PC‑DOS / DOS software release version 3.21 — a rare mid‑1980s operating system version designed for early IBM PC class computers. This edition may have been supplied with IBM systems or used as an OEM update. While primarily a minor revision of DOS 3.20, version 3.21 is of interest to collectors, historians of computing, and vintage PC enthusiasts.
Version: 3.21 (often associated with IBM’s PC‑DOS line)
Release timeframe: circa 1986‑1987
Platform: x86 IBM PC/XT/AT style machines
Format: Typically 5.25″ 360 KB floppy disks (check package)
Compatibility: Works with 8088/8086 based machines and early IBM PC clones
Notable change: Corrected keyboard support for IBM “Enhanced” keyboards and updated BASICA/BASIC components
The software package is used — optical/label condition may show wear consistent with its age
Disks have been visually inspected and appear intact (readability not guaranteed due to age)
Original packaging/manuals may be included or may be missing depending on variant
Ideal for vintage computing enthusiasts, software archivists or restoration projects
DOS version 3.21 disks (as shown in photos)
Any included documentation (manuals or registration sheets) if present
Please refer to item photos for exact contents
Vintage PC collectors seeking historic software versions
Hobbyists restoring early IBM PC / AT systems
Software historians documenting early PC operating systems
Retro computing enthusiasts interested in DOS lineage
This is software from the mid‑1980s, sold as a collectible item, readiness for modern use not guaranteed
Verify compatibility with your vintage hardware before purchase
Because of age, disks may require cleaning or special drive support for best readability
Add a piece of early PC history to your collection — bid now or buy with confidence!