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Do not bother to much with the details for now, assume standard stuff, make some test configs, do some measuring to make sure the axis moves the exact distance as commanded, let it rip!
You can make as many configs as you like for the same machine, you can even edit the scale and some other stuff while LinuxCNC is running and save from there, using the "calibration" from the "machine" menu.
It would help to know the exact screw pitch, so mark the screw and the nut with a sharpie, turn the screw several times, measure, enter that in the wizard.

Google suggests that they are both 1.8 degree (200 steps per revolution) motors, so stepconf's default values should be fine...

Thanks to both of you.Being somewhat impetuous, I put it all together and started tinkering while I waited for advice.... nothing's gone bang. Yet.

Yes: it's a G540. I've just been playing in the workshop and I found the preset for it. Using stepconf, I've been moving the x,y,z and A axes about, like a gleeful child with a new train set!

Sadly, the original computer is now dead and buried. I did keep the hard drive from it, but although I tried connecting it to another Intel motherboard (the original was an Intel dual core) I couldn't get it to boot. Now I think I need to verify the motors. Z and Y use Vexta PK268-02A but the x-axis appears to use an Italian motor HY 200 2232 - 160 88 looks like the model number. I shall have to do some Googling, to find data sheets.

I see a steep learning curve ahead......

Probably a kernel issue, so try installing another RT kernel.
packages.debian.org/search?keywords=linux-image-rt
There are several under the "Package linux-image-rt-amd64" section, try from Trixie and down.
To switch the kernels when powering on/rebooting, hold down the right SHIFT key until the GRUB menu shows up.

Is this the same machine i did reply to with RugBot a while back?
Did you try to find out what he/she is using for CAM? I do recall vaguely mentioning Inkscape somewhere but never checked.
Well id did check now, and it sure does output valid gcode that runs on LinuxCNC without any issues, and changing the scaling in the screenshot does change the angle as it should.
The best thing with Inkscape and GcodeTools is Python, so very easy to edit and modify, i did this for Plasma.

Since you asked for ideas, here i go:
-how hard would it be to run two interpreters and two trajectory planners?
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-with 2 of 7i94 i would look to have them connected via IDC26 for sure, real time and 1ms or less if faster servo thread is used, given the possibility of Mesa to have all pins as inputs or outputs
-this would also keep everything in hal and with some "creative" components would be much safer than any ModBus or serial.
Just checked, 7i94 has only one IDC26 that in your case is used for 7i77, so reverting back to Smart Serial, and here i have to stop as i have no idea if connecting two 7i94 through SS is possible, but i would venture a guess at yes, but might need some help from the Mesa master: PCW.

HI
Linuxcnc doesn’t support more than one toolpath, for example a lathe with two independent turrets. Typically, this is referred to as a dual path system. 

As seen on other posts on the topic on this forum, it is recommended to use two separate LinuxCNC systems, which is OK Now, I would like to link the two systems and im not sure what would be the best to do this.On the PC side, im planning to set up a local network so that the slave system can load a program written on the master system, so file sharing etc. there should be a lot of info on this on the web… On the linuxcnc side, im running a 7i94 +7i77 on each PC.Typically, I would like to have a link between the two linuxcnc systems so that the one system (master) can interface with some of the HAL data on the other (slave) system.It would be ideal if the master system can read/write hal pins (float and bit). It does not have to be realtime though, but I need it reliableI don’t know what is possible, but I was thinking a serial link from one 7i94 to the other would be the best solution.Is it worth checking out the Mesa Modbus method? Does this seem like a good idea or are there some better options? Your ideas would be much appreciated ThanksHenk

Does the Gecko have G540 written on it?
If not, does it have 4 of DB9 connectors? That would be the G540, so it has a standard pinout and the wizard included with LinuxCNC named StepConf has a pinout for it.
Also do keep in mind that if it turns out to actually be a G540, it has a very strange feature where it does only 1 pulse from 10 pulses on the input, it was labeled as microstepping but it is not, so you do need to add 10 in the wizard for microstepping.
See if you can find a used Dell OptiPlex 980 in the big case, those have a built in parallel port and work nicely with LinuxCNC, usually 30-70$.
You might also need a plain parallel port cable, or old printer cable, sometimes also named centronics.

You need to figure out the pin assignment of the parallel port connector. So the first thing I would try is to get the original Mach3 config file from the old PC. If I remember correctly it's an .xml file in the 'mach3' folder. This should tell you how the signals are arranged on the parallel port connector. This is needed to set up linuxcnc using the 'stepconf' tool.