[Simh] PDP11 oddity with RSTS 9.6

Mark Pizzolato Mark at infocomm.com
Wed Feb 3 14:52:01 EST 2016


Hi Gene,

It is not clear if you say you’re seeing the same behavior on 3.9 vs 4.0.

Please confirm.

Also your configuration file and the output of sim> SHOW VERSION on 4.0 will be useful.

The point of these questions is to determine if you’re having a simh issue or a rsts issue.


-          Mark

From: Simh [mailto:simh-bounces at trailing-edge.com] On Behalf Of Gene Irwin
Sent: Wednesday, February 3, 2016 11:47 AM
To: simh at trailing-edge.com
Subject: [Simh] PDP11 oddity with RSTS 9.6

Hello guys,
I have tried simh 3.9 and 4.0 and have this odd issue.
I got a copy of a built rsts on rpo6, and the copies of the .tap files used to gen this image.  it is v9.6.
If I boot the prebuilt hard drive image the system comes up just fine.
If I boot the tape and go through the sysgen process the hard drive image that is built has no lp0: device in the monitor, and the spooler fails during boot and keeps the rest of the start.com<http://start.com> script from running, making the system come up in a single user mode with job max at 2.
I've tried diferent processors (11/70 up to 11/94), LPT is enabled in simh, and I'm not sure what to try next.
If I boot the prebuilt image and do show devices _LP0: is present.
If I boot the sysgen'd image and do show devices, there is no _LP0:
anyone got any ideas?
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