Upgraded to 2.7.13 -- W T F --

Now running Axis sim demo and it looks OK

Now running my old HDD with edit grub.cfg = added isolcpus=2,3 and no more hanging as it looks now anyways, still testing PC here in office before I go down to my Lathe.

4.9.0-6-rt-686-pae # SMP PREEMPT RT Debian 4.9.88-1+deb9u1 (2018-05-07) i686

Looks like it's going good for the time being.
Did install a 64 bit or 32 bit version ?

My kernel shows as 4.9.0-6-rt-amd64 (which is good for Intel 64 bit systems and AMD 64 bit systems).

Doesn't matter really 32 or 64 bit I guess
It's amazing how much faster the net install is if have a debian mirror on a home server

Mesa 7i76e = 64bit RT_PREEMPT

Just curious as to why you have a 686-pae kernel (which is for i386 ie 32 bit) on a 64 bit system

According to JT's notes you should have from uname -a:
4.9.0-6-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux

Even this page only lists 686-pae for i386
packages.debian.org/stretch/linux-image-4.9.0-6-686-pae

While this is the listing for 64 bit
packages.debian.org/stretch/linux-image-4.9.0-6-amd64

Out of interest can you run and

This is my old install from my previous PC that did go broken.

My misunderstanding I thought that RT PREEMPT always is 64bit.
Anyhow that install has been running my lathe with 7i76e until the PC got damaged.

But the fresh install I made is most likely 64bit as I followed the text file you linked to.
But if this works (the old HDD) OK I have all my installs set among them the struggle with Touch so then I will keep it that way, maybe if I get some spare time (on pension = very busy) I will try to get Touch installed to the other HDD.