Автор 
«The X.25 Interface Co-Processor/2 attaches a RISC System/6000
system unit to an X.25 packet switched network. This adapter provides a
single port that will accommodate one of three selectable interfaces:
X.21, EIA-322-D/V.24, and V.35. The adapter’s on-board software is
capable of processing inbound and outbound data streams to off-load
communications tasks from the system processor. The adapter supports
full duplex synchronous or asynchronous protocols and is suppied with
512KB of memory» [International Catalog of Micro Channel Adapter
Cards].