-trying to send nmra doesn't work:
- 8a 67 8a 67
- ff ff 7f no response
- 8a 55 8a 55
- etc.
+avoid retransmitting too often (S9.2 C l114-)
-led is wrong when we just run the program ? surely it should be red
-
-points do not finish changing and cdu does not recharge
-
-crashread of a slave does not 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
layout polarity diagram colourful segment encoding: