Cal States only use the 1600 scale for the old and New SAT since they only focus on the Math and English sections. The essay section is not included in the Eligibility index calculation.
Also EI’s can fluctuate from year to year by as much as 200 points depending upon the stats of each in-coming Freshman class. Use last years EI to gauge your chances. Apply for CS if are within the 100-200 range since it could be lower this year or consider applying to Software Engineering instead.