You'll have to count VM/370 as a minicomputer OS - IBM's XT/370 runs a 4-meg version of VM, with virtual memory and everything. It's conceivable that MVS (or some version thereof) will one day run in this computer too. Of course you may not want a 370 system sitting on your desk... J. M. Barton AT&T Information Systems Laboratories ...!druny!jmb