Thus it was written in the epistle of Juergen Hees, > Ich have changed a 927LX with MPE/iX 4.0 to a 918RX with MPE/iX 5.5. > When I logged on the DTC 48, on the console the message "logon for op.sys > on LDEV 110 appears, and then the System hangs. > System abort 1458 From subsys 102 > Secondary Status: Info = -37 Subsys=107 > Systemhalt 7, $05B2 > > Has anyone else having this problem ? Jürgen, Here's a little recommended reading: http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9705D&L=hp3000-l&D=0&P=9600 http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9705D&L=hp3000-l&D=0&P=9663 http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9705D&L=hp3000-l&D=0&P=9726 http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9705D&L=hp3000-l&D=0&P=11071 http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9801D&L=hp3000-l&D=0&P=25661 http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind9803B&L=hp3000-l&D=0&P=4153 You don't say what, if any, power patch level you are at, but there were some 5.5 powerpatches which caused problems. You'll want to be at PP7 if at all possible. Other than that, get a dump (as repeatedly advised above :-) and call the response center. HTH, Ted -- Ted Ashton ([log in to unmask]), Info Sys, Southern Adventist University ========================================================== Without the concepts, methods and results found and developed by previous generations right down to Greek antiquity one cannot understand either the aims or achievements of mathematics in the last 50 years. -- Weyl, Hermann (1885 - 1955) [Said in 1950] ========================================================== Deep thoughts to be found at http://www.southern.edu/~ashted