I'm home on Thanksgiving break and thus have access to that old PSR-270 which my sister inherited. So I took the liberty of sampling it from that board and making a NSMP.
The .nsmp file is attached. A zip file with all the .wav samples and the project file is available here.
I've done my best to keep noise levels to a minimum, but the synth it came from is a really noisy board.
I have received absolutely no permission whatsoever from Yamaha to sample their decade-old sound. We all know how badly their sales will be devastated by one sound being made available to a bunch of Nord owners (who are far too pretentious to give Yamaha their money anyway).
One bug right now is that it's coming out an octave high on the NS2, even though I corrected this in the sample editor. Thoughts...?
Sample:

