This is the first computer I ever wrote code for, the Univac 1218 computer, a Navy data processing system. I was a computer operator on a US Navy ship and whiled away the long hours writing all kinds of fun programs. I went on to repair these things before I got out of the service. This isn't me, by the way. :)
By the way, this computer is an 18-bit computer (using octal readouts) and 4K wire core memory. It was awesome.