I think this whole thing is going to drive me crazy : ) CALL MATOUT(S,2,2,2,2,4HS) needed to be.... CALL MATOUT(S,2,2,2,2,4HS ) why this works I have no earthly idea... Just so you'll know, the 4HSbbb (where b is a blank) construct is a Hollerith constant, which is how strings were represented in o...