-detector on detector seems to spuriously set B1 or B2 or at least
- panic DR when we honour it
+more keystroke commands
+
+speed changes immediate
+
+labels for keys
+
+race between cdu off (due to watchdog or short) and points
-crash readout: master i2c should go into known state
layout polarity diagram colourful segment encoding:
make moveable feature selection in subseg2display bitwise rather than