diff --git a/src/devices/TfIO16Bricklet.cpp b/src/devices/TfIO16Bricklet.cpp
index 5068077..144ec01 100644
--- a/src/devices/TfIO16Bricklet.cpp
+++ b/src/devices/TfIO16Bricklet.cpp
@@ -197,7 +197,17 @@ void TfIO16Bricklet::setPort(char port, uint8_t value_mask) {
 }
 
 void TfIO16Bricklet::setPort(char port, uint8_t pin_mask, bool value) {
-	throw TfError("Not implemented", TfErrorCode::E_UNKNOWN_ERROR_CODE);
+	uint8_t mask;
+	if (port == 'a') {
+		mask = outMapA = (outMapA & ~pin_mask) | ((value ? 0xFF : 0x00) & pin_mask);
+	} else if (port == 'b') {
+		mask = outMapB = (outMapB & ~pin_mask) | ((value ? 0xFF : 0x00) & pin_mask);
+	} else {
+		std::ostringstream ss;
+		ss << "Unknown Port: " << port << ".";
+		throw TfError(ss.str(), TfErrorCode::E_INVALID_PARAMETER);
+	}
+	setPort(port, mask);
 }