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Message: <blockquote data-quote="BillM" data-source="post: 4297978" data-attributes="member: 45785">Vacuum tube computers were viable, there was just a failure of imagination concerning them. And you can also build computers with relays. I understand the guy who ran IBM back then thought there might be demand for any many as 4 or 5 computers in the whole world. I have more than that in my living room... <img src="/images/smilies/wink.png"  class="smilie" loading="lazy" alt=";)" title="Wink    ;)" data-shortname=";)" />And back when newly portable computers were available, people who wanted to take one to the USSR were advised to refer to them as a calculator, as typewriters and duplicators were rigidly controlled.</blockquote>