Technically yes and technically no. Yes there were two versions of Ys 4 one for the Turbo/PC engine CD and one for the SNES but they were not produced by Falcom but NEC/Hudson and Tonkin House respectively and were based on some input from Falcom but the real Ys 4 the one actually done by Falcom, Ys: Memories of Celceta was on PC and PSP.
Right, but that's a sort of remake (more a replacement) done years later. My point was that the series went console only earlier on than you said. I know the two Ys IVs were different games and neither made by Falcom, but they were still official *and* console only.