diff --git a/digital-inputs/firmware/digital_inputs.cpp b/digital-inputs/firmware/digital_inputs.cpp
index 3896b3e..c2d79f9 100644
--- a/digital-inputs/firmware/digital_inputs.cpp
+++ b/digital-inputs/firmware/digital_inputs.cpp
@@ -3,20 +3,24 @@
 #include "digital_inputs.h"
 #include "chprintf.h"
 
-io_pin addrPins[] = {
+#define XOR_MAGIC 1
+
+static io_pin addrPins[] = {
 {GPIOC, 8}, // ADR0
 {GPIOC, 6},
 {GPIOC, 5},
 {GPIOA, 6},
 };
 
-io_pin scenarioPins[] = {
+static io_pin scenarioPins[] = {
 {GPIOB, 12}, // OUT0
 {GPIOB, 11},
 {GPIOC, 7},
 {GPIOC, 4},
 };
 
+static io_pin muxOff = {GPIOA, 7};
+
 extern BaseSequentialStream *chp;
 
 void initDigitalInputs() {
@@ -29,12 +33,15 @@ void initDigitalInputs() {
         io_pin *pin = &scenarioPins[i];
        	palSetPadMode(pin->port, pin->pin, PAL_MODE_OUTPUT_PUSHPULL);
     }
+
+    palSetPadMode(muxOff.port, muxOff.pin, PAL_MODE_OUTPUT_PUSHPULL);
+    palWritePad(muxOff.port, muxOff.pin, 0 ^ XOR_MAGIC);
 }
 
 void setOutputAddrIndex(int index) {
     int param = index;
     for (size_t i = 0;i<efi::size(addrPins);i++) {
-        int bitState = index & 1;
+        int bitState = (index & 1) ^ XOR_MAGIC;
         index = index / 2;
         io_pin *pin = &addrPins[i];
         chprintf(chp, "output %d: bit=%d %d\n", param, i, bitState);