This hardware is claimed to be software compatible with the 4361 Integrated Communication Adapter. It executes HDLC's link level protocol and deals with the 370 software at the level of I-fields of the underlying HDLC frames.

We propose an object, the adaptor, that wields the sole keys to the 9370 HDLC interface. It implements the CK key as used by the X.25 multiplexor that works with our Series One X.25 support.

The hardware architecture (appearance of hardware to the software)

Kernel problems with buffers that cross page boundaries.

Design of 9370 HDLC Adaptor