A transistorized IBM mainframe introduced in 1959. A. Michael Noll made some of the first computer art on one at Bell Labs in the early 1960s.
During that summer, I had access to this incredible IBM 7090 computer—huge computer system—and it had an incredible graphics machine on it: the cathode ray tube microfilm plotter, used mostly for printing text but also could do graphics and plots. I was using it to plot the results of the Cepstral analysis.
A. Michael Noll, A. Michael Noll on When It All Started