In an announcement likely to prove a bit of an embarrassment to the Open Software Foundation alternative Unix club, IBM yesterday said that its AIX-370 mainframe version of Unix, due to ship next month, will be late and deliveries will now be phased in over 1989, with early support in second quarter and a general availability date announced in July. AIX PS-2 Network File System, Transparent Computing Facility and X25, all for PS/2s, also promised for next month, are put back to the fourth quarter of 1989.