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Operating systems on retrocomputers generally.

2 votes

What was the earliest system to explicitly support threading based on shared memory?

Although not the earliest example, in 1973, IBM released APL.SV (A Programming Language | Shared Variables). Variables (of any number of dimensions) could be shared between instances (effectively thre …
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3 votes

Why was preemptive multitasking so slow in coming to consumer OS's?

In the case of the Macintosh, Apple kept promising preemptive multitasking in the "next" release, going back as far as version 5 or 6 of the Mac OS, but it never happened until OS X. A version of A/UX …
rcgldr's user avatar
  • 745