> very simple to create and use microemacs edition with QNX             (em-4.0.
> 18.tar.gz) in CLI mode.
> SNS

Yes, it compiles and runs with very little trouble. However, "as is" it does a spinwait for characters from the keyboard
. This eats up all the CPU, which causes Photon sessions to hang. The solution is to put a nanosleep() in the spinloop, 
in the file termio.c, in the routine ttgetc(). I used a value of 1 millisecond.

There might be a way to tweak the configuration settings to avoid the spinloop altogether, but this turned out to be 
easiest for me.