 provide hooks for configuring hardware
        and producing default and upgraded configuration stanzas.</p>
    
    <p>These changes affect only those who have written custom drivers.</p>
    <table>
        <tr class="first_row">
            <td style='width:50%'>2.7</td>
            <td>3.0</td>
        </tr>
        <tr>
            <td>
                <pre class='tty'>import weewx.<span class="changed">abstractstation</span>
    
class ACME960(weewx.<span class="changed">abstractstation.AbstractStat