-detector on detector seems to spuriously set B1 or B2 or at least
- panic DR when we honour it
+avoid retransmitting too often (S9.2 C l114-)
-point setting doesn't seem to work
- residual stuff from CDU is present and changes pt0 when you
- * turn on
- * say `+' to master to turn on CDU
- * switch to programming mode
- pt0 on pic2 is the one nearest the switch box, moving to hacker's right
- (we think - I haven't checked this yet)
+as a result of running, then touching track near panel to induce detection
-crash readout: master i2c should go into known state
layout polarity diagram colourful segment encoding:
make moveable feature selection in subseg2display bitwise rather than