Date: Thu, 05 Sep 2013 12:02:04 +0200
From: Johnny Billquist <[email protected]>
To: [email protected]
Subject: Re: [Simh] single cycle stepping for pdp11
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 2013-09-05 07:15, Mark Pizzolato - Info Comm wrote:
On Wednesday, September 04, 2013 at 10:08 PM, Doug Snyder wrote:
it appears that simh supports single instruction stepping, but not single cycle
stepping for the pdp11.
Hi Doug,
The core behaviors of the simh simulators are built around the execution of
instructions. This is the level which things are simulated at.
What problem are you trying to solve or deal with your request to be concerned
about clock cycles?
And even further - single cycle stepping will mean different things on
different models of the PDP-11. Or rather, different models do different
amounts of work in a single cycle.
I worked for years on PDP-11s, and never heard of this single cycle
stepping.
I can imagine there might be a jumper on one of the boards that enables this
for customer engineer's debugging, but as far as I know you only got single
complete instruction stepping with the halt switch. I worked with the
11/20, 11/34, 11/45 and even the CalData emulator.
Jon
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