Jet PropulSion Laboratory DiSplay Information SyStem. Query SyStem for UNIVAC 1108 [or PDP' S?] written in Fortran, baSed on TymShare' S "Retrieve". Indirectly led to Vulcan which led to dBASE II. Jack Hatfield, George MaSterS, W. Van Snyder, Jeb Long et al, JPL.