MS-DOS 3.20
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Here's what one of the MS-DOS 3.20 diskettes looked like.

> ![MS-DOS 3.20 Programmer's Reference](MSDOS320-DISK3-PROGREF1-thumb.jpg "link:MSDOS320-DISK3-PROGREF1.jpg:nogallery")

And the box, courtesy of [www.oldcomputermuseum.com](http://www.oldcomputermuseum.com/os/msdos_3.2.html).

> ![MS-DOS 3.20 Box](http://www.oldcomputermuseum.com/os/os_files/msdos_3.2.jpg)