This problem of old or new hardware isn't unique to LinuxCNC PCs.  This small 
$10 moisture sensor for a Maytag Combo Washer/Dryer has been discontinued.  I'm 
waiting for the epoxy to dry but ultimately if I can't remanufacture it with 
glue or 3D printing then we're out $1K for a new machine.
 
How is this relevant?  I'm finding the older PCs have hardware that is no 
longer supported by the newer software.  It's been that way for quite some 
time.  The developers upgrade to 4 core processors and OS support while end 
users are still using single core.  An upgrade suddenly takes the old existing 
system to its knees.
 
I'm of the line of thought that when you buy, you buy the most modern and 
highest end unit you can find.  Odds are it will remain supported for much 
longer than the old stuff.  In effect that tiny software change is the $10 part 
that prevents that old system from running.
 
John
https://cdn.appliancepartspros.com/images/product/cache/whirlpool-sensor-tub-304997-ap4037380_01_l.jpg
 
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