Ars OpenForum

The trouble was that GUIs took a while to develop, and they took up more resources than their non-GUI counterparts. In a world where most 286 clones came with only 1MB RAM standard, this was going to pose a problem. Some GUIs, like the Workbench that ran on the highly advanced Amiga OS, could squeeze into a small amount of RAM, but AmigaOS was designed by a tiny group of crazy geniuses.

WTF? The original Mac in 1984 had 128k of RAM. Even in 1985, having a GUI running in 500k did not require "crazy geniuses", just clever and frugal programming. And multitasking was possible on the 512k Mac, too.
 
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