Ask HN: Who's still keeping a DOS machine up because the business depends on it?

A Hacker News discussion reveals that many businesses still rely on legacy DOS machines and software, including dBase/Clipper applications, industrial instruments controlled by ISA cards, and specialized equipment like chromatography analyzers and wool testing imagers. Commenters share experiences keeping these systems running using emulators like vDOS and 86box, as well as maintaining vintage hardware like 386 computers and OS/2 machines because replacing them would be prohibitively expensive or legally risky. The original poster is researching ways to migrate these legacy systems to modern hardware while preserving their functionality.