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I just tried it and solved the issue for myself for the future.
I have difficulty updating to the new version of qtvcp and probebasic. I decided to postpone this process. I don't have time yet. But in the test configuration I tried the encoding cp1251, if I remember correctly. The test configuration reads my files correctly, but my machine does not work. I hope I am expressing my thoughts clearly.

In the first position of the encode_utils.py file I inserted the cp1251 encoding
But you can check it yourself. At the beginning of the topic I attached a file with Russian text.

CSS is using spindle.speed-in to do something, correct? What does the control loop look like for that? Does it influence the speed-out based on the speed-in feedback or something with the feed based on speed-in?

Geesh the first thing I remeber using a parallel port for was tone generation using a R2R digital to analogue converter (well a buffer connected to 2R2 network), almost a very frequency function generator.
Then using it to power some a steppers via a H-Bridge for a silly little robot platorm. Then some 433MHz remote control, a "sledge hammer" logic analyser knocked up a breadboard, a DCC model train control station, first running under DOS, then wrote a vxd in assembly for win95 to replace the DOS TSR. Probably some other stupid stuff as well.

Never got to play with thing like zip drives, ethernet or sound with the parallel port, used to get most of my stuff 2nd hand at computer markets, this was before ebay took off. Kind of miss wondering around the markets and seeing what exotic stuff you could get.
AT one time I actually used it for connecting to a printer, had to get rid of my HP Laser Jet just last year, to be honest I found it on the side of the road and got a good 10 years of service out of it, made quite a few PCBs using the toner transfer method. That doesn't make sense nowadays when you can get 5 double sided PCB shipped down under for about $7 AUD, just a bit of a wait that's all.

Ahhh that's right I used laplink as well for transferring files. MSODS 6.22 had Intersvr & Interlnk for file transfer aswell.

post your gcode file, i can test it out this week. I havent tested out CSS yet, and ive been trying to figure out how it works. because with threading it runs fine, but with CSS i think it is using the spindle speed-in pin.

If spindle0.speed-in has control on the rpm signal based on the feedback it receives, that would make more sense of your issue.
You removed the lowpass filter gain from the hal file. Im not sure what it defaults to. 0.001 was the gain that worked for me without jumping around, but it took longer to stabilize at speed
Monitor this pin on the halshow, spindle.0.speed-in when trying to css, and see what it looks like.

Your spindle PID in the ini file arent hooked up to anything, so they wont do anything.

RE: spindle gain, sorry about that murphy, I got confused between some configs and got some decimals mixed up. The correct way is 100/maxrpm.

Also when I set the gain to 0.0025 which should be the correct value for 4000rpm. It doesn't scale right. I need to input 0.02 for it to work.

if it works, whatever, but maybe look into it. with gain at .02 that would make 4000rpm 8volts.