On 2017-03-06 11:58, Warren Toomey wrote:
I've tried all of the SET CPU IDLE values and I can't find a value that lowers the CPU usage below 100%. Is there a compile flag that I need to set? The
host system is Ubuntu 15.10 and Linux 4.2.0-42-generic.

I guess idle pattern detection missing or broken in simh for the particular
guest OS. I'll have a look.

and I can happily telnet in. Now I want to set up two SimH instances so
that one DZ line connects the two together. I've read the vax780_doc.doc
but I can't see how to configure an outbound connection.

This is much better document in the top comment section in
https://github.com/simh/simh/blob/master/sim_tmxr.c

A snippet below. Let me know if that doesn't help.

Line specific tcp listening ports are supported. These are configured
    using commands of the form:

        sim> attach MUX Line=2,port{;notelnet}
Direct computer to computer connections (Virutal Null Modem cables) may
    be established using the telnet protocol or via raw tcp sockets.

        sim> attach MUX Line=2,Connect=host:port{;notelnet}
Computer to computer virtual connections can be one way (as illustrated above) or symmetric. A symmetric connection is configured by combining
    a one way connection with a tcp listening port on the same line:
        sim> attach MUX Line=2,Connect=host:port,listenport
When symmetric virtual connections are configured, incoming connections on the specified listening port are checked to assure that they actually
    come from the specified connection destination host system.
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