Tech Museum

ADM3 Manufactured by: Lear Sigler Model: ADM3A Year: 1977 Details here and here. Back somewhere after the dinosaurs but before PCs, people interacted with "real" computers through a terminal. The first common terminal was the Teletype (110 baud), and after that, CRT terminals like this one, which were a huge improvement in both speed, and decibels. As stated on the old-computers.com link above, the ADM-3A was one of the first affordable serial display terminals manufactered by Lear-Siegler, Inc of Anaheim California. As such it was found almost everywhere that early computers were found from the mid 70s through the 80s. </div></div> </td> </tr> </table> </div> <br /> <footer > <div class="navbar-nav"><br /><br /> <a href="https://www.barrettmanor.com/pages/xyzzy.aspx"><img src="https://www.barrettmanor.com/images/webmaster.gif" alt="Barrett Manor Webmaster" height="15" width="128"/></a><br /> <p style="text-align: center" >Copyright 1995-2026, Stately Barrett Manor</p> </div> </footer> <script src="https://code.jquery.com/jquery-3.6.2.min.js" integrity="sha256-2krYZKh//PcchRtd+H+VyyQoZ/e3EcrkxhM8ycwASPA=" crossorigin="anonymous"></script> <!-- JavaScript Bundle with Popper --> <script type="text/javascript" src="https://www.barrettmanor.com/Scripts/shorten.js"></script> <script type="text/javascript">$(document).ready(function () { $(".comment").shorten({ "showChars": 800, "moreText": "See More", }); });</script> <script src="https://www.barrettmanor.com/Scripts/lightbox.js"></script> <script> $(document).on('click', '[data-toggle="lightbox"]', function(event) { event.preventDefault(); $(this).ekkoLightbox(); });</script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script> </body> </html>

ADM3
Manufactured by: Lear Sigler Model: ADM3A Year: 1977

Details here and here.
Back somewhere after the dinosaurs but before PCs, people interacted with "real" computers through a terminal. The first common terminal was the Teletype (110 baud), and after that, CRT terminals like this one, which were a huge improvement in both speed, and decibels.
As stated on the old-computers.com link above, the ADM-3A was one of the first affordable serial display terminals manufactered by Lear-Siegler, Inc of Anaheim California. As such it was found almost everywhere that early computers were found from the mid 70s through the 80s.