[Simh] Understanding the Front Panel Code in SIMH

[Rob Jarratt]

I am trying to understand how the front panel code works so I can write a
front panel for an emulator that I am writing. There are a couple of things
I am not sure about.

 

One is why the SET REMOTE MASTER command resets everything by calling
reset_all? This causes me a problem because I have commands to load the
initial boot code into memory, set the program counter etc as commands that
I setup in the config file before calling the
sim_panel_start_simulator_debug function, which then appends the
aforementioned SET REMOTE MASTER command, which blows away all my setup.

 

This also begs the question of how it is intended to work with ini files
when using the front panel. I am not sure that I should have to bake the ini
file commands into the console code. I know I could just copy the ini file
to the temporary config file before calling sim_panel_start_simulator_debug
but it seems a little inelegant and I am not sure what the intention is
here. Can anyone explain to me how this is intended to work?

 

The other thing that I am confused about is when the displayed registers are
supposed to be updated. I had assumed that when the simulator is running you
would want to update the displayed registers on a regular basis. But the
update_display variable is only updated when the simulator is sent
REGISTERS_REPEAT_ECHO, and that only ever happens if a new register has been
added to the panel. The rest of the time update_display is not changed and
so the display of the register values does not change as the simulator
executes. How is the panel intended to give a "real time" display of the
register values?

 

Thanks

 

Rob

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