Linuxcnc build requirements for RTAI kernel

These are all my views:
-RTAI is being phased out as there is no need for it
-replaced by RT Preempt as it does everything, almost
-RTAI can not do ethernet machine control
-RTAI had issues with graphic drivers
-RTAI had issues with power saving stuff and would keep processors at max speed always
-RT Preempt has very good latency on new PC's
-RT Preempt works with parallel port
-i love parallel port, still use it, still advise others to use it
-add on parallel ports have issues, some are dummy software emulated ports so do not work for machine control, makes choosing one a cr@p shoot
-a member of this forum is still working on it, he is a kernel developer, but for Gento Linux, so a quick search for "gento rtai linuxcnc" should find his topic.
-and i do understand your enthusiasm about it, on older PC's using RTAI goes from unusable to very usable.
-what did i forget?

Andy was maintaing RTAI and the RTAI version of LinuxCNC, it is still in use and documented on the Downloads page.
Would be nice if you can lend a hand to both of them, thank you.
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Not important, but i had a Fujitsu-Siemens workstation with 2 of 4 core Xeons that did reliably run with 15000 base period. That is over 50kHz on all pins.
Some machines i build can do with 300000 base period as they move at max 3m/m, drives directly by 16 tooth GT2 pulleys.
It all depends on what is needed for a certain job, back when i started "helping" on cncforum i got tired of comments like "linuxcnc is useless as it demands good latency" and "linuxcnc complains about latency while mach3 just works", got tired of explaining that mach3 does not care it just skips whatever it can show down the parallel port.
At the very least, LinuxCNC had the decency of informing about it.

I can do that on RT kernel, on a PC that cost over 1100 Euro about 3 or 4 years back, without graphic card.
But that is an exeption, hence i refrain from mentioning it except when someone here asks.
I also have core2duos running machines with RTAI kernel and parallel port, plenty of them.
Might seem i am trying to skip RTAI, but i am not, i am using it and will be using it for a long time, i also have some PCI to parallel add on cards, so i am with you, i would hate to see it gone.
Thank you for insisting on that not happening.

forum.linuxcnc.org/38-general-linuxcnc-q...ich-are-out?start=10

github.com/NTULINUX/RTAI/blob/master/README.INSTALL