curious claim questioned [was RE: Free IBM system/1(?) in eastern US.]

Rich Alderson RichA at
Tue Nov 22 20:00:07 CST 2016

From: jim stephens
Sent: Tuesday, November 22, 2016 3:21 PM

> the Ultimate system was the only Non IBM written supervisor / system 
> that ran on mainframes at the time.

You're going to have to be more specific than that.  At what time?  On
what mainframe(s)?  Are you saying that by the time Ultimate, whatever
that is when it's at home, was running, no other non-IBM OSes were
running on IBM hardware, all others being dead?  Or that Ultimate was
earlier than, say, MTS on IBM hardware?  And are you claiming that no
other manufacturers' systems are mainframes?  What are you saying?


Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computers: Museum + Labs
2245 1st Avenue S
Seattle, WA 98134

mailto:RichA at

More information about the cctech mailing list