Did you know? In 1986, Microsoft released a version of MS-DOS which supported preemptive multitasking for compatible applications.

This version was called MS-DOS 4.0 and is completely unrelated to the proper, widespread version of MS-DOS 4.0 from 1988! pic.twitter.com/H0brGcFmjL

— BetaWiki (@BetaWiki) April 25, 2024