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Looks like installing LinuxCNC isn't as easy as installing a casual linux.I remember I had to burn DVD when I first installed it and I borrower a DVD drive to install it properly.I flashed the image using Rufus 4.7 and booted from the USB flash drive - but  then the setup mentions "your installation media coultn't be mounted". Is this a known bug? What's the workaround?Also I was unable to set the BIOS to UEFI mode only. There's no option to disable the compatibility mode - so setup outputs warnings when using USB flash drive in EFI mode.

The link in the html manual does not work. Is this spreadsheet still available?

I see. So is there something like GRBL for output, but used for encoder-inputs?
Like an Arduino or Teensy based encoder-decoder?

I just started um this old computer. There's an old Grub 1.98 with Ubuntu 13 installes. Linux 2.6.32-122-rtai (I probably installed this about 10 years ago )
Also I have to change the bios battery, since it is empty.
It has an Intel D425 installed and 4GB memory.


//Edit: github.com/AlexmagToast/LinuxCNC_ArduinoConnector
That might to the trick. I'm sure there's at least one Arduino Mega2560 within the range of two meters around me. Also I can see at least 5 Arduino Uno in front of me

Thank for the help!

As to what caused the damage, disconnecting/reconnecting the DB25 cable from the
7I77 if there is an (even small) ground potential difference between the PC and the machine
can damage interface components so should only be done with all power off.

That's probably what happened, definitely my screw-up!

Tomorrow, I can look at the schematics and see what parts on the 7I77 are in the ENCMUX
signal path (I think just one Hex inverter)

Thank you!

/Peter

After not having a single bit of Linux, let alone LinuxCNC experience beyond knowing the name, I'm quite happy with what I accomplished within the space of a few weeks. Took a CNC converted lathe and turned it into a dual head urethane grinder with notching and grooving cutting. I'll take what wins I can get at the moment. I'm fairly certain as time progresses and my understanding expands, I'll look back on what I did and facepalm at my "work". For now, I have to stick with the old saying: If it's stupid and it works, it's still stupid and you're lucky.
Thanks for the resource, I will go through it as I have other homework sources I need to review to gain a better understanding of this system.

Basically as I said before, this points to an issue with ENCMUX. 

It may be a damaged 7I77 buffer chip for this signal
or in may be an on board 7I77 issue. The ENCMUX
signal is om DB25 pin 17. 

A 5i25 problem is still possible but less likely (damaged I/O pins
tend to be stuck low so can be detected with the simple mesaflash test)

I would definitely scope/trace the encmux signal.

As to what caused the damage, disconnecting/reconnecting the DB25 cable from the
7I77 if there is an (even small) ground potential difference between the PC and the machine
can damage interface components so should only be done with all power off.

Tomorrow, I can look at the schematics and see what parts on the 7I77 are in the ENCMUX
signal path (I think just one Hex inverter)