> > %VMB-F-SCBINT2, PC = 00103E58, PSL = 041F0000. > ?06 HLT INST > PC = 00000F06 The PC value shows that it happens in the boot program. How old is the boot program you use? You can try the newest boot program, fetch it with ftp from multivac.ludd.luth.se. -- Ragge