After I sent you that private message I was able to get most of my problems sorted.

I now have the machine talking to Windows 10 through a cheap RS485 convertor that took me three tries (two blown convertors and 1 5 amp fuse) to figure out.
Turns out the red wire coming from the AXYZ RS485 D9 connector is 5vdc and was used to power the original proprietary converter as back in the days these hooked up to serial port which had no power. Of course, modern USB supplies 5v power to the device so I just used the green and white cables as send and receive and then the black as ground. Left the red power cable out of the mix altogether. Had to reverse green and white but once I did, it connected seamlessly. There was a bit of messing about with the comm port number in the laptop setup as well. Was a strange mental trip back to the late 90's for that bit but once the fog cleared I figured it out.

Finally connected, it was brought to my attention that there was no OS installed on the machine but I have a disc image courtesy of my friend who has a 5' x 10' version of the same vintage that has every possible file and driver that you could need for these machines and I was able to upload the OS easily. Once that was successful the machine automatically ran the warm up protocol that was missing and I now have full control of the spindle.

I'm using the DNC software(taken from the same disc) to send the files across to the machine. Works flawlessly.

I put Google Drive Desktop on the machines laptop(which I do for all my machines) and now the files I generate on my MAC in Fusion 360 are available via the cloud. No USB stick needed.

Was able to run a file of mine but I know it was wrong. I put this down to the post process. I need to do some work on that tomorrow and get it sorted.
I also have to figure out the setting of heights and surfaces as I git that wrong but i built in quite a bit of tolerance so no damage done.

WIll cut some basic shapes to confirm calibration once I figure it out and will let you know how that goes.

Fantastic machine all 'round. I really like that once the file is loaded onto the machine the laptop is no longer involved. As an owner of a Stepcraft 600, two Chinesium machines and an old Grizzly Mill CNC conversion(all running UCCNC) this is by far the best of the bunch(the Grizzly would be second). When I first got the machine I was fully prepared to convert the entire electronics package to UCCNC and ethernet control but I'm glad I stuck this out. These are serious controllers and would be hard to beat.

If you want a copy of this disc image, I'd be happy to dropbox it to you or anyone needing files for these machines.

I have a number of manuals too. they are huge and have not been scanned yet but could be done.