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Cheers. That's much clearer.
Looks like I'm hitting temperature limits occasionally. I think I may need to get the dremel out and add some ventilation to my case. The stock pi case doesn't seem designed for airflow.
Upgrading to a Pi 4 seems to have speeded things up a bit and improved stability. Just found some more Pis so it seems I have four standard ones of varying vintage and two zeros. Need to work out what I'm doing with them and probably get rid of some older ones.
aggi
@Stonehedge
vgencmd outputs hex which you need to convert to binary. Position 0 is undervolt detected if set to 1.
https://harlemsquirrel.github.io/shell/2019/01/05/monitoring-raspberry-pi-power-and-thermal-issues.html
EDIT: Don't forget that you work from right to left with binary in terms of register numbers