diff --git a/sim/state/motor.ts b/sim/state/motor.ts
index e2a5c9f0..fffab968 100644
--- a/sim/state/motor.ts
+++ b/sim/state/motor.ts
@@ -16,18 +16,19 @@ namespace pxsim {
                 data,
                 beforeMemRead: () => {
                     const outputs = ev3board().outputNodes;
-                    console.log("motor before read");
+                    // console.log("motor before read");
                     for (let port = 0; port < DAL.NUM_OUTPUTS; ++port) {
                         const output = outputs[port];
                         const speed = output ? Math.round(outputs[port].getSpeed()) : 0;
                         const angle = output ? Math.round(outputs[port].getAngle()) : 0;
+                        const tci = MotorDataOff.TachoCounts + port * MotorDataOff.Size;
                         const tsi = MotorDataOff.TachoSensor + port * MotorDataOff.Size;
-                        data[MotorDataOff.TachoCounts + port * MotorDataOff.Size] = 0; // Tacho count
+                        data[tci] = data[tci + 1] = data[tci + 2] = data[tci + 3] = 0; // Tacho count
                         data[MotorDataOff.Speed + port * MotorDataOff.Size] = speed; // Speed
                         data[tsi] = angle & 0xff; // Count
                         data[tsi + 1] = (angle >> 8) & 0xff; // Count
                         data[tsi + 2] = (angle >> 16) & 0xff; // Count
-                        data[tsi + 3] = (angle >> 24) & 0xff; // Count
+                        data[tsi + 3] = (angle >> 24); // Count
                     }
                 },
                 read: buf => {