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System76 tries to talk Colorado down over OS age checks
(www.theregister.com)
This is a most excellent place for technology news and articles.
Applesoft was in ROM. The DOS was only for the disk controller. Without a disk drive I could still work the memory map, execute code, allocate memory, calls to locations, speaker calls, graphics control, load off of cassette, etc. That is the definition of an OS.