When people talk about Macs or Mac OS, they’re most likely referring to what was previously and perhaps lovingly called “OS X”. That “X” is, of course, the Roman numeral that notes that this is the 10th incarnation of Apple’s desktop operating system. Few of today’s Mac users have probably used Macintoshes before that, let alone older versions of their favorite operating system. Whether you’re discovering it for the first time or planning a nostalgia trip, a new macintosh.js project now lets you run the 90s era Mac OS 8, even without owning a 90s era Macintosh.

Slack developer Felix Rieseberg has shown off his programming chops at using Electron, the Javascript application framework that Slack itself uses to build its popular communication tool. 
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https://www.slashgear.com/mac-os-8-emulator-lets-you-relive-the-past-for-the-first-time-30631311/