<p>Digital computers have existed since at least 1945 (ENIAC). That's 78 years ago. The pace of change in computing is remarkably fast, and it's unusual to have things that have existed for a long time. Here's a few that have been used for at least 50 years (i.e., they existed in 1973), even if they've changed over time and the original version may not be compatible with the modern world:</p><p>* 3.5 mm TRS audio plug (1950s)<br />* ASCII (1963)<br />* EBCDIC (1963)<br />* C (1972)</p><p>Can you think of others?</p>
