[Simh] single cycle stepping for pdp11

[Doug Snyder]

for pdp11s, single cycle stepping refers to single bus cycle stepping, not
single clock cycle stepping.

for instructions that make several memory access, the processor can be
stopped at each memory access in order to examine the address and data for
each memory access.  this can be very useful for low-level software or
hardware debugging.

doug




On Wed, Sep 4, 2013 at 10:32 PM, Doug Snyder <dsnyder at blueshiftinc.com>wrote:

> many (if not all) of the pdp11 models support single cycle stepping.  to
> more accurately model an actual pdp11, it would be nice if simh could model
> that feature.  not being able to model that feature is certainly not the
> end of the world, but it is a noticeable difference.
>
> doug
>
>
>
> On Wed, Sep 4, 2013 at 10:15 PM, Mark Pizzolato - Info Comm <
> Mark at infocomm.com> 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.
>>  >
>> > if this is the case, have there been attempts or requests to add single
>> cycle support?
>>
>> 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?
>>
>> - Mark
>>
>>
>
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