TU80's use an IRG of 1.2". In 4.2 dump look for the constant 7 (.7") and change to 12 in dumpmain.c, dumptape.c, and dumprtape.c. You might want to do an mt ioctl call and set the IRG based on the tape type (close enough for DEC drives, not accurate for all emulations), or perhaps (yet another) option to dump. Bill Shannon Sun Microsystems, Inc.