Comment IBM 1130 (Score 4, Informative) 39
The first machine I programmed was an IBM 1800 which was an extended version of the IBM 1130 with added cabinets for industrial control. It had 16k words (18 bits) of core memory but with the FORTRAN runtime system loaded there were only 4k words left for the user program so we had to learn how to segment our programs so they could be explicitly paged in/out. That had to be managed by the user program, there were no virtual memory features in the monitor (OS). All of that was done using punched cards :-)
This museum looks interesting, I will definitely have a look at their IBM 1130 stuff.
This museum looks interesting, I will definitely have a look at their IBM 1130 stuff.