TPLOT is a utility to convert a 4105 graphics file to 4014 mode so it can be printed. If you want to print a 4105 file on any cluster printer use:
$ TPLOT FOO.4105 RT0 print 4105 file on RT0
PSPLOT is a utility to print a 4014 or 4105 graphics file as a PostScript file.
$ PSPLOT FOO.4105 HL1_PS print 4105 file on HL1 $ PSPLOT FOO.PLT HL1_PS print 4014 file on HL1 $ PSPLOT FOO.PLT HLDAS_1LW print 4014 file on HLDAS Laserwriter