Stimulating Simulating

Now that you have learned to edit and have edited Screens 148 and 200 it is time to simulate the code - six NOPs and a jump back to the start. I have done just a "jump to start" program (the hardware guy's minimum standard. A favorite for the Z-80 set.) but then there would be nothing to see. So let us simulate.

Print out the chart in Section 7.5 on Page 31 of the DB004 document. It will help you understand what the simulator is doing.

Type in “so <cr>”. That will bring up the simulator and its control panel. Use the “F” key to single step through the program. Well OK. Node 100 is not the main focus. You can change that by using the “M” key. And change it back with the same key. You are now well into the program and you would probably like to see it from the start. That is what the “A” key is for. Now you can start “F”ing from the beginning.

That is all you need to get you started running programs in the simulator. There are some other commands that will interest you if you want to go deeper. You can try them out on this simple program without getting into much trouble. When you are done the spacebar will get you out of the simulator.

Leave simulator - <spacebar>

Step/stop - “F”
Fast/slow - “S”
Go continuously - “D”
Back to beginning - “A”

Increase step size +1 - “V”
Decrease step size -1 - “C”
Increase step size +100 - “R”
Decrease step size -100 - “E”

Swap focus (yellow and red cores in the display) - “M”
Scroll through focus core's memory, increasing - “,”
Scroll through focus core's memory, decreasing - “.”
Display alternate core's memory or active core display - “/”

Display sizing
Taller - “Q”
Wider - “W”
Shorter - “Z”
Narrower - “X”

Select focus node. Use the “M” key to move the other node.

Left move - “J”
Right move - “;”
Up move - “K”
Down move - “L”

To move the block of displayed cores around

Left move - “U”
Right move - “P”
Up move - “I”
Down move - “O”