Thanks to all. The system now boots (at least partially) into VMS 5.1: 7..6..5..4..3.. Tests completed. Loading system software. 2..1..0.. VAX/VMS Version V5.1 Major version id = 1 Minor version id = 0 .. PLEASE ENTER DATE AND TIME (DD-MMM-YYYY HH:MM) PLEASE ENTER DATE AND TIME (DD-MMM-YYYY HH:MM) 04-MAR-2005 03:04 $! Copyright (c) 1988 Digital Equipment Corporation. All rights reserved. The VAX/VMS system is now executing the system startup procedure. %%%%%%%%%%% OPCOM 4-MAR-2005 03:06:19.27 %%%%%%%%%%% Logfile has been initialized by operator _OPA0: Logfile is SYS$SYSROOT:[SYSMGR]OPERATOR.LOG;762 %LICENSE-I-LOADED, DEC FORTRAN was successfully loaded with 50 units Now all that remains is to get Quasijarus onto some TK50s so I can run the One True UNIX. Thanks again for your patient help! John