As long as we are talking about the good old days, my first computer, not
mine personally but the first one I programmed and worked on, was a Bendix
G-15. It was a four by four by six foot cubeic like structure full of,
yes, vacuum tubes. It had a spinning drum with a whopping 2k of memory,
nothing like RAM at all. It spoke only binary and used punch
tape. Sometimes, I thought my slide rule was faster.