1.   Sales of mainframe systems are still thought to be earning the biggest profit.

2.   Where computer systems have been investigated they have been large mainframe systems.

3.   And experts have come to realize that the problem goes far beyond mainframe computer systems.

4.   Companies including International Business Machines Corp. and Digital Equipment Corp. were hit by the switch from proprietary mainframe systems to networked systems of personal computers.

5.   IBM delayed introduction of its new mainframe storage system, the RAMAC II, until the fourth quarter amid a shortage of power supplies for the new machines.

6.   IBM faces a four-week shortage of components because of better-than-expected demand for its new mainframe systems, investors said.

7.   IBM has been weaning itself from relying on large mainframe systems for its business to focus on high growth businesses, such a services, software and networking equipment.

8.   In any merger of big companies, which tend to have vast, aging mainframe computer systems, integration is hard work.

9.   Siemens and Fujitsu also sell a fairly broad range of other equipment, from computer networks and servers to big mainframe systems.

10.   Some analysts say Centriplex will give client-server customers many of the same data-storage and network-security capabilities now found only on mainframe systems.