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https://en.wikipedia.org/wiki/Multiuser_DOS

There was a Concurrent DOS, and there were quite a few others: topview, taskview, doubledos, vm/386, to name a few. I remember reading this article (p. 22) sparking my imagination as a kid: http://bitsavers.trailing-edge.com/magazines/Microsystems_Jo...

> I wrote TSR's that snatched cycles off the timer interrupt

We've all been there. How else could you get anything interesting done back in the day?

For a long time I figured that was just the right way to do multitasking. Hook the interrupt and pass control to the next task when you are done. I also figured most of what I wanted was popup TSRs anyway - how can a human possibly pay attention to more than one program at a time? Makes me wonder how much my brain has changed over the years by being exposed to a multitasking and multiple windows on a large screen.