Electrically Programmable ROM.
Higher than normal voltages are required to program (save information) to this kind of ROM.
Typically a large IC with a paper sticker covering a little glass window.
The memory can be reset or cleared with ultra-violet light.
The robot worked fine until it's uncovered EPROMs were exposed to sunshine.
A very simple video display terminal without the capability of re-positioning the cursor so that lines of text roll off the top of the screen like an infinitely long roll of paper feeding into a paper shredder.
The user interface was strictly glass tty, the application doesn't even repaint the screen.