Hi Steve,
Yes the IBM 1800 was the industrial version of the 1130 family.
I recall meeting someone who had seen in person the 1800 which controlled/sequenced the
traffic lights in Manhattan midtown area in NYC through the 1980s or later.
So a real time controller. I had not heard of a real time OS for 1130 family, thanks for
the info. Hope someone might find a distribution deck for it would be fun to add the
instructions to the simulator at
ibm1130.org
I have a special fondness for those as my very first (in high school) assembler real time
interrupt driven code was a standalone punch for the card reader.
The A26-2918-3 Functional Characteristics is still a really nice read (available at
archive.org).
-Robert