I thought the FCS was restricted to 90 players during fall camp, and then additional walkons could join the team after school started or the first game, whichever came first.
But Wikipedia says 95 players for FCS:
NCAA Division I
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Scholarships
Division I FCS schools are currently restricted to giving financial assistance amounting to 63 full scholarships. As FCS football is an "equivalency" sport (as opposed to the "head-count" status of FBS football), Championship Subdivision schools may divide their allotment into partial scholarships. However, FCS schools may only have 85 players receiving any sort of athletic financial aid for football—the same numeric limit as FBS schools. Because of competitive forces, however, a substantial number of players in Championship Subdivision programs are on full scholarships. Another difference is that FCS schools no longer have a limit on the number of new players that can be provided with financial aid in a given season, while FBS schools are limited to 25 such additions per season. Finally, FCS schools are limited to 95 individuals participating in preseason practices, as opposed to 105 at FBS schools (the three service academies that play FBS football are exempt from preseason practice player limits by NCAA rule).