.\" Copyright (c) 1983 The Regents of the University of California.
.\" Redistribution and use in source and binary forms are permitted
.\" provided that the above copyright notice and this paragraph are
.\" duplicated in all such forms and that any documentation,
.\" advertising materials, and other materials related to such
.\" distribution and use acknowledge that the software was developed
.\" by the University of California, Berkeley. The name of the
.\" University may not be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\" @(#)hdh.4 6.2 (Berkeley) %G%
hdh \- ACC IF-11/HDH IMP interface
.B "device hdh0 at uba0 csr 166740 vector hdhintr"
device provides an HDLC Host (HDH)
interface to an IMP. It is normally used when participating
in the DARPA Internet. The controller itself is not accessible
to users, but instead provides the hardware support to the IMP
pseudo-device must also be included.
The initialization routine was entered even though the device
did not autoconfigure. This indicates a system problem.
.BR "hdh%d: cannot get chan %d uba resources" .
Insufficient UNIBUS resources existed to initialize the device.
This is likely to be a shortage of UNIBUS mapping registers.
This indicates that both the HDLC and HDH protocols have declared the
This indicates that the link to the IMP has died.
.BR "hdh%d: HOST SEQUENCE ERROR"
.BR "hdh%d: IMP SEQUENCE ERROR"
.BR "hdh%d: HOST DATA ERROR"
These errors indicate that an HDH protocol error has been detected.
.BR "hdh%d: cannot get supervisor cmnd buffer" .
This error indicates that an
could not be allocated to send a command to the IF-11/HDH.
Any other error message from hdh%d: indicates a serious error
detected by either the driver or the IF-11/HDH firmware.
projects / unix-history / blob