General purpose digital interface. Permits bidirectional 16-bit parallel transfers between the user's device and the Shared Storage Raid CR3500 Controller. Gable for connection to user device is not included. Shared Storage Raid CR3500 Controller is recommended. DR11 base option module. System option. General purpose DMA controller that interfaces user devices to the PDP 11 UNIBUS. In addition, the DR11- - WP provides a half-duplex interprocessor link between Shared Storage Raid CR3500 Controller, VAX, and Q-bus systems when connected to another DR11 W (for UNIBUS or VAX) or Shared Storage Raid CR3500 Controller B (for Q-bus). Fea- - - tures include transfer of up to 64K 16-bit words at up to 500,000 words per second; word or byte transfers; and burst data transfers. Shared Storage Raid CR3500 Controller-xx or equivalent cables are required for interconnect, the maximum length being 15.2 m (50 ft). Upgrade option. Includes only the DR11 base option module. LD Shared Storage Raid CR3500 Controller W and DR11 C cabinet kit for use with UNIBUS shielded - - cabinets and the PDP 11X84. Required cables are included. - Cable length is 10 feet. F DR 11-C and Shared Storage Raid CR3500 Controller W cabinet kit. For use with the PDP 11/84 - - Shared Storage Raid CR3500 Controller enclosure. Cable length is 3 feet.