    <p>
      The <b>TI-80</b> is a <a
        href="https://en.wikipedia.org/wiki/Graphing_calculator"
        title="Graphing calculator">graphing calculator</a> introduced
      by <a href="https://en.wikipedia.org/wiki/Texas_Instruments"
        title="Texas Instruments">Texas Instruments</a> in 1995 to be
      used at a <a href="https://en.wikipedia.org/wiki/Middle_school"
        title="Middle school">middle school</a> level (grades 6 to 8).<sup
        id="cite_ref-:0_1-0" class="reference"><a
          href="https://en.wikipedia.org/wiki/TI-80#cite_note-:0-1"><span
            class="cite-bracket"></span><span class="cite-bracket"></span></a></sup>
      It offered advanced capabilities that had previously only been
      available in high-end <a
        href="https://en.wikipedia.org/wiki/Scientific_calculator"
        title="Scientific calculator">scientific calculators</a> to
      students learning <a
        href="https://en.wikipedia.org/wiki/Pre-algebra"
        title="Pre-algebra">pre-algebra</a> and <a
        href="https://en.wikipedia.org/wiki/Algebra" title="Algebra">algebra</a>,
      and was designed to be affordable for schools.<br>
    </p>
    <p>
      <br>
      <sup id="cite_ref-2" class="reference"><a
          href="https://en.wikipedia.org/wiki/TI-80#cite_note-2"><span
            class="cite-bracket"></span><span class="cite-bracket"></span></a></sup><sup
        id="cite_ref-:0_1-1" class="reference"><a
          href="https://en.wikipedia.org/wiki/TI-80#cite_note-:0-1"><span
            class="cite-bracket"></span><span class="cite-bracket"></span></a></sup></p>
    <a href="hpr4471_image_1.png"><img src="hpr4471_image_1_tn.png">
    </a>
    <h3>
      Links</h3>

    <ul>
      <li><a href="https://en.wikipedia.org/wiki/TI-80">
          https://en.wikipedia.org/wiki/TI-80</a></li>
      <li><a href="https://zadig.akeo.ie/">https://zadig.akeo.ie/</a><br>
      </li>
      <li><a
href="https://rmccurdy.com/.scripts/downloaded/HoustonTracker%202%20%20Windows%2011%20Tutorial%20TI-82%20Silverlink.zip">https://rmccurdy.com/.scripts/downloaded/HoustonTracker%202%20%20Windows%2011%20Tutorial%20TI-82%20Silverlink.zip

        </a></li>
    </ul>
    <p> <br>
    </p>