i wouldn't be so optimistic as the guys above.. if u have no CS-related courses whatsoever, such as discrete math, data stru, algo, etc. Most MSCS program will reject u without even looking at ur application.. sorry but it's the hard truth.. i think u should apply for certain CS programs that are designed for ZHUAN CS.. such as Upenn MCIT, USC 37, NEU Align, etc.
if u apply for EE, CE then its fine, but in job market CS is more CHI XIANG..
Another suggestion is to try some computational program, such as Gatech CSE (sometimes it offers TA/RA with tuition waiver)