All are windows ce because filesystem is FAT16 on system
EOL in all text files is CRLF (this means windows not linux-unix).
Drive names are with letters (not mount paths) and file path with inverse slash (\).
Also controller has full tcp/ip stack and functions that only full operating systems offer
like windows-linux-unix (NOT dos).
Windows CE has realtime versions (with realtime kernel).
All evidence seems that all are windows embedded arm architecture (pendant and controller) .
Advertisement say not PC based (means not x86/x64 based) doesn't say not windows based.
I will investigate more but am almost sure that OS is windows embedded (realtime).