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

Rich Alderson RichA at
Thu Sep 17 18:17:53 CDT 2015

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?


Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134

mailto:RichA at

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