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That likely means the 7I77 has been damaged
(or perhaps has very low 5V)

 

With mesa powered and linuxcnc not started aout0 shows 2.8v and aout1 shows 3.3v.
These are the pins going to the drives. On the other free pins we get 3.3v. This is TB5
On TB1 (5v) I get 4.75v. TB5 is powered from the computer psu.
By the way this setup already worked and we did cut 12mm sheets.
On TB8 outpus I don’t see any voltage. I will post the ini and hal file later.
If you have any other debugging steps I’m all ears.
With aout0 and aout1 disconnected when I enable the machine there is no jolt since drives are disconnected but I still get the same error.

I would think the simplest option would be a used PC with a parallel port
and one of those "Mach 5 Axis" parallel port breakouts. 

For a small amount of 5V, a safe option is to just use PC USB power
(which is what the "Mach 5 Axis" BOB does)

The mouse issue sounds like EMI so likely a grounding/line filter issue with the servo drives

Ethernet is much more EMI resistant than USB so that may be a latency issue.

To check network latency, run this:

sudo chrt 99 ping -i .001 -q -c 60000 [card_ip_addr]

Where [card_ip_addr] is either 192.168.1.121 or 10.10.10.10 depending on the 7I76E settings

This will run for 1 minute and print timing statistics