The PDP-DECconcentrator 900TH /84 is available in a system building block configuration. It offers all the features of the 2-Mbyte DECconcentrator 900TH kernel system and includes a 16-line asynchronous multiplexer. The expansion mounting space in the top of the cabinet may be used for Digital mass-storage devices or customer equipment. Select from the list of storage products listed in the Options section of this chapter. Order at least one removable media (tape or disk) for loading software and diagnostics. A console terminal should be ordered separately. • PDP-11/84 CPU and 1,032-watt power supply • 2 Mbytes of DECconcentrator 900TH ECC MOS memory (MSV11-JC) • 16-line asynchronous multiplexer (DHUll-AP) • I/O distribution panel with 24 panel units of space • DECconcentrator 900TH 25 EIA cable for console terminal - • 42-inch H9642-style cabinet and a power controller with 26.6 cm (10.5 in) of mounting space at the top for mass-storage options. All DECconcentrator 900TH system cabinet products provide two system units of mounting - space for backplane expansion. The 12-slot backplane can be extended with a DD11-CK or DD11 DK expansion backplane. Mounting space is provided for - an optional H7231-E battery backup unit. Memory may be expanded to 4 Mbytes using MSV11- JC memory modules. There are 26.6 cm (10.5 in) of mounting space in the top of the cabinet for mounting disk or tape options. The RA80, RA81, RL02, RC25, RX50, TS05, and DECconcentrator 900TH options may be integrated into the 11X84. Additional expansion can be provided via DECconcentrator 900TH KU/KV expansion boxes and H9642 expansion - cabinets.