parallel port no longer detected by LinuxCNC and neither by dmesg, failed?

Some yes, some no.

OK, is it possible the address has moved and linuxCNC cant see it any more?

Yes it is, and to prevent that from happening you have to set the BIOS to manually assign addresses and IRQ.

Did you just post another topic and then delete it ?
It was there, now it is not, something about a Dell 9020 ?

Yes I have two PCs. The original is a Dell T1500 driving a chinese 6040Z, used to work perfectly. For my new/second CNC, a workbee I am trying to build a Dell 9020 to run it. So Ive been struggling for 2+ days to get a test bed going with the newer Stretch based LinuxCNC version I messed the screen shots up so deleted that post and re-did a new post. Rather tired after 2 days and 14+ hours days struggling with it. Anyway I took the T1500, a known working machine using old LinuxCNC wheezy off my 6040Z to try it on this the other BOB intended for the Dell 9020 (a new MESA 7i96 I ordered has been lost in the US for 6 weeks now) as the stepconf is identical as far as I can tell, and that didnt work either. Trouble is the T1500 no longer works either. I am wondering if the BOB is bad in some way and has damaged the PP cards or Ive wired it wrong, but I cant see how when its supposed to be optically isolated. Pic of test setup encl. The TB6600 is just for a test I have James Newton's drivers I have to yet solder up.

Ok the parport module was no longer loading by itself.

forum.linuxcnc.org/38-general-linuxcnc-q...port-problems-solved

modprobe parport_pc

lsmod | grep parport

shows it loaded as does dmesg after a reboot. 6040Z now works again but the time with the PCI-e parallel port (or its original PCI port) no issues so the hardware is fine.