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I have found the problem to the error
It should be like this:
N44 G90
M99
not like this:
N44 G90 M99
It does not like to be on the same line

Can you describe the jitter, I suppose you hear clicks or gravel noise from the servos?
Is it always like a steady stream of those noises or are the bursts every few minutes?
Please elaborate.

If i leave G91 and g90
It gives me an error:
Bug: Reached convert_stop() from M99 as subprogram return

Btw I'm on Debian 10 with linuxcnc 2.8.4

After some back and forward i have an analog output. the scale gain is suited for 18k rpm. The rpm limiting needed to be added otherwise an incorrect value, say M3S30000 could be input with 0v output on the pin. Unfortunately this doesn't limit the gui rpm.

# Load required components
loadrt limit2 count=1
loadrt scale count=1
loadrt conv_float_u32 count=1

# Add functions to servo-thread
addf limit2.0 servo-thread
addf scale.0 servo-thread
addf conv-float-u32.0 servo-thread

# Configure RPM limit range
setp limit2.0.min 0
setp limit2.0.max 18000

# Connect motion RPM output to limit2 input
net gui-rpm spindle.0.speed-out => limit2.0.in

# Output from limiter feeds scale
net clamped-rpm limit2.0.out => scale.0.in

# Scale: gain = 1 / 18000 = 0.22
setp scale.0.gain 0.22
setp scale.0.offset 0

# Connect to float→U32 converter
net scaled-float scale.0.out => conv-float-u32.0.in
net final-u32 conv-float-u32.0.out => lcec.0.0.Analog-Output-0

Its a bit tricky to setup a PID speed control with a unipolar analog control
and FWD/REV signals.

I would first try eliminating the feedback by running the spindle open loop
you can do this by setting all PID terms to 0 except FF0 which should be  set to 1.0

If you need feedback (this is rare unless the spindle speed control is very poor)
The structure needs to be like this:

PID command = signed commanded spindle speed in RPM
PID feedback = encoder RPM
PID output --> ABS --> analog out
ABS sign (of PID output) determines the FWD/REV pins

Sorry, I guess the images didn't upload. "hm2_5i24.0.7i83.0.2.analogout0 <= spindle-speed-DAC" reads in forward and reverse. In reverse it shows a reading of 8.25 and stays there, doesn't move when trying to adjust the speed.. In forward it stays around 2.69 with some variation in the next 5 digits. It moves up and down with speed adjustment.

www.welectron.com in Germany has only 7i96S in stock right now
www.eusurplus.com in Portugal has all mentioned above in stock
eusurplus.com/index.php?route=product/product&product_id=64
or
eusurplus.com/index.php?route=product/product&product_id=159
eusurplus.com/index.php?route=product/pr...t_id=105&search=7i85

7I95T looks good. But I couldn't find a cheap German oder european source. There's a German shop that has none in stock. Just contacted them to see when it'll be re-stocked

Will this be a good choice for a hobby machine?
de.aliexpress.com/item/1005005087476488.html

gnipsel.com/linuxcnc/flexgui/index.html

Is the Phoenix the 600x600x600 one with cnc machined parts?
If yes, probably will not be released, i recall they mentioned it was made for a client so they might not approve.
Adding my view here, there are 3D models for Voron with 9 or 10mm wide belts, i built one with those at a 460x460x1200mm size, so no need to wait, just print the gantry and toolhead parts for wide belt and size it up as you see fit.
Resizing a Voron is easy, use their wizard on the website, it spits a complete list of parts with actual sizes.

Post to change the title back to Remora - NVEM / EC300 / EC500.

A 7I95T combines the functions, or a 7I96S+ a 7I85, or 7I85S can do it in two cards

Sure, but I would get rid of the LPT-port requirement and could use any computer, not only this specific one (if broken one day...).

Which Mesa card would be your go-to in 2025?

And is there a card combining outputs (for the stepper drivers) as well as inputs for linear magnetic encoders or would this be a combination of two cards?

N25 G0 X0. Y0. Z25.
N26 M99
O3
N27 G91 G0 Z-23.
N28 G1 Z-12. F300

When i Look at this lines, there is incremental rapid from Z25 to Z2 and feed move incremental to -10
The moves with G3 are all incremental G91, so a pitch of 1, with lead in and out exactly to Z0
Line 44 switch back to abs G90