release dates of early microcomputer operating systems, incl. Intel ISIS

Paul Koning paulkoning at
Thu Sep 17 20:06:20 CDT 2015

> On Sep 17, 2015, at 7:17 PM, Rich Alderson <RichA at> wrote:
> From: Eric Smith
> Sent: Tuesday, September 15, 2015 12:48 AM
>> On Twitter, @hotelzululima suggested Motorola MIKBUG, introduced in
>> 1974, but IMO it's a monitor, not an operating system.
> So the PDP-6 monitor, which booted from DECtape but had no other dependency
> on that medium, was not an operating system?  It provided multiple timeshared
> jobs, so was not a single-program system.
> TOS/360 was not an operating system?
> Do only disk-oriented operating systems deserve that sobriquet?

Clearly that would be silly.  Not to mention the RT-11 operating system, which could boot and run with just DECtape.  Or the famous THE operating system, which boots from paper tape (though it pages to drum at runtime).


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