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Parrallel port has failed on my old computer , running Ubuntu 10.4 and EMC2 2.4.6 . Milling machine has Pico USC , Microkinetics Steppers , Linear Scales for Position feedback.  Old computer is a mishmash of crap that has no network capabilities.
I need the easiest upgrade path , for a computer and Software . Im old and not very tech savy!  I may go to a Mesa board if it would make things easier. Any and all recommendations!

Thanks for the "inmux" hint, it's so true that the 7i95 board has inmux-type input and output pins. Now I have connected the right input pin, and my external emergency stop button is working fine. I have added the following hal command line in my .hal file...

net estop-out iocontrol.0.user-enable-in
net external-estop-in hm2_7i95.0.inmux.00.input-00 => iocontrol.0.emc-enable-in

Let me know if it can be further simplified.

Kindly do me another favor by giving the piece of hal command line to do the x-axis feed override control using an external analog DC power supply from 0 to 10 volts 
 

How is the input wired?

The 7I95/7I95T input pairs have an input common
so if you are supplying +5V to the input, the input common
must connect to 5V common (negative)

Note the you have to have 5V to reliably activate the input
4V is marginal (the input threshold is about 3.9V)

Make sure you are using the "WATCH" tab in halshow
not "SHOW"

Also note that  the 7I95/7I95T isolated inputs are not hal GPIO
pins but rather hal Inmux pins (0..23). 
 

Thank you for the quick reply. 

I am trying to use input pin 0 on the TB6 tab of the Mesa 7i95 board. I am supplying 5 volts on and off, but the status of the input pin (hm2_7i95.0.gpio.000.in) is not changing in the Halshow monitor window, but the LED of the mesa board of the 0 input pin is getting on and off.
[img]blob:https://web.whatsapp.com/4e39dfa6-8d10-42c3-af3d-452f787f1698[/img]

I want to add an emergency stop and feed override button.

I have asked the same question ("Adding external switch for emergency stop and feed override") in my thread posted one day before, requesting you to look at that also if possible.