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Gillham code
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<p>Gillham code is a zero-padded 12-bit <a href="/facts/Binary_code/v5YF0sQl">binary code</a> using a parallel nine- to eleven-wire <a href="/facts/Interface_(computing)/zdfp8unT">interface</a>, the Gillham interface, that is used to transmit uncorrected <a href="/facts/Barometer/M8VQc69q">barometric</a> <a href="/facts/Altitude/B5eNVurK">altitude</a> between an encoding <a href="/facts/Altimeter/dHEXhjQK">altimeter</a> or analog <a href="/facts/Air_data_computer/lYhFIknC">air data computer</a> and a <a href="/facts/Digital_data/JChckAvr">digital</a> <a href="/facts/Transponder_(aviation)/V8IlEPHc">transponder</a>. It is a modified form of a <a href="/facts/Gray_code/HtbVlM7T">Gray code</a> and is sometimes referred to simply as a "Gray code" in <a href="/facts/Avionics/F4gQJBJn">avionics</a> literature. </p>