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I've just spent an unfruitful few hours searching through the HAL stuff to write a simple spindle speed set routine.
HALUI allows me to increment and decrement it in 100s but nowhere can I put in 350rpm and get it.
Is it so obvious that I've missed it?
Can I make the HALUI steps smaller, 10 or even 1, and 'buzz' it up and down?
There is an 'Increment=' value for a spindle0 in the INI but changing that from 100 didn't help.
Can I fake up an S command?
I'm sure you smart guys have done it and I must confess it is to use the mill for a pretty deviant job not pure metal cutting but...

Thanks for the replies, finally disabling #SERR in the BIOS settings helped.
I uploaded the bin file 5i25t_7i77x2d.bin to the card
Now I am dealing with creating a configuration using PNCconf. I don't have a choice of 5i25t card here. Should I create the files for the 5i25 card and then overwrite the .hal file of the 5i25 to the 5i25t?