Error,

Since the PPMC issue started when you changed the PC, it suggests that there may be something
wrong with the new PCs parallel port (either LPT mode, address, hardware/cable issues etc)

You may need to get Pico Systems/Jon Elsons help here. I suspect he has some LPT diagnostics
that can help narrow this down

I reinstalled the old computer and checked its parallel port settings this computer was set as PS2. I have attached the error with this system

This is what I get when running Linux CNC from terminal.

That basically showsthe same error as shown in the dmesg list
(PPMC card not found so likely parallel port/EPP/PPMC issue)

Very likely not related to your previous latency issue and possibly something wrong with
your new PC setup

Also you may have disturbed something with the PPMC when changing PCs

PCW wrote: That basically showsthe same error as shown in the dmesg list
(PPMC card not found so likely parallel port/EPP/PPMC issue)

Very likely not related to your previous latency issue and possibly something wrong with
your new PC setup

Also you may have disturbed something with the PPMC when changing PCs

Starting LinuxCNC...
enshu.hal:868: Pin 'ppmc.0.encoder.04.position' does not exist
Shutting down and cleaning up LinuxCNC...

Doesn't this mean there is a card problem? The HAL file has this under spindle.
# spindle feedback
net SpindleRevs motion.spindle-revs ppmc.0.encoder.04.position

It means the PPMC card(s) are not found (as the dmesg says)

The pin is not found because the PPMC driver failed to load because it found no PPMC hardware

This suggests something wrong with the new PCs LPT interface since it was working before