Update README.md
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<p>* These values get stored to EEPROM and are retained between power cycles. </p>
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<h3>Pinout</h3>
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<pre><p><b>PB1 - Pin 9 (Output)</b> <= Audio Out GND=No-tone<br>
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<pre><p><b>PB1 - Pin 9 (Output)</b> <= Audio Out (=Gnd when no tone)<br>
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<b>PB5 - Pin 13 (Output)</b> <= LED On=+V<br>
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<b>PD2 - Pin 2 (Output)</b> <= Key/PTT On=+V<br>
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<b>PD3 - Pin 3 (Input)</b> <= Synchronize START=Gnd<br>
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<b>PD4 - Pin 4 (Input)</b> <= DIP Switch Bit 0 (pulls down)<br>
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<b>PD5 - Pin 5 (Input)</b> <= DIP Switch Bit 1 (pulls down)<br>
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<b>PD6 - Pin 6 (Input)</b> <= DIP Switch Bit 2 (pulls down)</p></pre>
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<b>PD3 - Pin 3 (Input)</b> <= Synchronize (mom. switch to Gnd)<br>
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<b>PD4 - Pin 4 (Input)</b> <= DIP Switch Bit 0 (switch to Gnd)<br>
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<b>PD5 - Pin 5 (Input)</b> <= DIP Switch Bit 1 (switch to Gnd)<br>
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<b>PD6 - Pin 6 (Input)</b> <= DIP Switch Bit 2 (switch to Gnd)</p></pre>
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<p>A schematic design, a bill of materials, and a source for ordering a printed circuit board will be made available soon.</p>
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