The S-50 is a 61-key 16-Voice sampler / keyboard. It has 750k RAM. Is 12-bit with 16-bit DACs, and 15/30kHz sampling.
Note that it does not have TVFs/TVAs as does the S-330 and S-550.
It is a decent unit, but not up to par with current technology.
Try to get the tablet, and use a CRT with it.