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Did you get any reasonable offer?

What if you connect the 7i84 to the 7i85 and use the 7i96S SSerial for PktUART ?
Just an idea as wiring the 7i84 to 7i85 works without any setup and requires simple unplug from 7i96S and plug to 7i85, but also editing the hal to change the SSerial card channel.
Edit:
See below about SSerial on 7i96S and 7i85

Anyway, back to the problem in hand. When I run my installation, I'm getting a lot of missing content in the "cycles" tab:
 

And the command line errors currently look like the contents in the attached text file.
 
It looks as if there is something seriously wrong in the Gtk / python / gladevcp bit. Could somebody suggest how I might troubleshoot / resolve these errors?
LinuxCNC seems to run OK but the macros are still not showing up. Many thanks.

Just upgraded to 2.9.x from 2.7.x i am in the process of recreating my glade window with gtk3. All worked good in 2.7.x and gtk2 but now with 2.9.x and gtk3 this code below in my ini file deletes the the box_vel_info but does not start the motion_control_test.ui
not sure what is going on. help is appreciated

EMBED_TAB_NAME = MOTION CONTROL
EMBED_TAB_LOCATION = box_vel_info
EMBED_TAB_COMMAND = gladevcp -x {XID} motion_control_test.ui

Hi, remora-1.1.0 is now over 4 years old. Please try the main branch which will give you the latest remora-spi component.

That's a very slow SPI frequency and is probably taking longer than a servo thread to send the full packet, hence the lag.

I'd suggest working on your noise issue to improve it as much as possible so that you can increase the SPI frequency. An occasional "bad SPI payload" is not a show stopper.

Wow! Lots of replies that I was hoping to receive an email about. >.> 

I'll admit, Arduino would absolutely be a better platform for this, considering the timing overhead of running the entire Linux kernal for the sake of a single stepper motor. That being said, (and at the risk of falling prey to sunk cost) I'd really like to use this as a jumping off point to using LinuxCNC for other stuff down the line. Also, I've got the Pi in hand, whereas I'll have to order an Uno clone to pivot on hardware. 

I'm also hoping to make the solution a black box that presents a web interface advertised to `turntable.local`, so that my uncle can control the thing from any device on the LAN. I'm pivoting from using the desktop interface because he's hoping to use a tablet to control the turntable. (Personally I think a touchscreen would be KISS, but I'm not going to argue with the 'customer'.)

Or enter G0 X-40 in the MDI for it to go to -40 degrees.

G0, huh? I think that might be my ticket in under the hood, assuming I can get the HAL config all figured out. I'm going to give that a go before I make another topic asking for help adapting a `STEPCONF` output.

Can confirm: Rob fixed two issues that I had with the images before I even reported them. Don't be like me, folks, check to make sure the issue is still an issue in the latest image BEFORE you report it.

Itś all good now. Thanks

1. USB-LAN adapters should not be used on production machines, USB has inherent latency issues
2. from your explanation it seems like interference issues, so is the machine and PC properly grounded?

Hello,
I get the error mentioned when a milling operation has run to completion or when I stop an operation with the stop button.
I have attached some pictures. My Mesa card is connected to a USB-LAN adapter.
Thank you very much for your help.

I just switched MESA connection from the USB-LAN adapter to the intern LAN adapter and the error is gone... the reason i didn´t take the intern LAN was my post monthś ago forum.linuxcnc.org/9-installing-linuxcnc...to-connect-to-github but now it also works.

Ok mea culpa, SPI was not enabled. As an apology, after about the fourth OS change I forgot about it out of nervousness.
Thank you, I hope it will be without problems.

What RPi model are you using and what image are you using.

spi hasn't been enabled in config.txt

This is very interesting. I recently purchased a Ozaki CNC lathe with mach3 control. I don't really liked the mach3 too much, but it worked well enough. Then my HDD crashed and this seemed to be a very good opportunity to go ahead and convert it to Linuxcnc...

But then, what about the used Pokeys 56U? Then I found this. Hope it connects with the 56U too, really good to find this.

ok, I made the sink configuration for output01 with setp now within custom.hal:
hm2_7i76e.0.7i76.0.0.output_source 0xFFFD
setp hm2_7i76e.0.7i76.0.0.output_sink 0x0002
-> works as expected, thanks a lot

cnc@raspberrypi:~$ ls /dev/spidev*

ls: cannot access '/dev/spidev*': No such file or directory