From the ibm archives photo gallery.

My father worked with the IBM 1620, the Control Data Corporation's CDC 6600 & the Cray 1 supercomputer, which looks like a monolith.

These last two were designed by Seymour Cray.

The 1620 took punchcards and required the entire operating system to be fed in every time it was switched on, since it lacked anything but 60,000 digits of volatile storage. It got the nickname CADET (Can't Add Doesn't Even Try) through its use of lookup tables instead of adders to perform arithmetic.