The purpose of the buttons:
"U","D"change the address of the ROM cell for each counter,
"R" - resets the address counter to 0.
"0", "1", ... , "7" - invert the corresponding bits in the ROM (RAM)
"P" - protection against loss of information at the zero address after switching off the simulation (On-editing, Off-storage)
After changing the data, we switch the "P" switch to the Off
position, save the contents of the ROM to a file (binary or text), turn off the simulation, save the scheme. The next time you run it, the contents of the ROM are restored. If it is undesirable to save the contents of the ROM in the schema, then in its properties (for all three ROMs), set the "Persistent" parameter to False.
It's easy to see that the scheme scales easily: you can throw away the extra ROMs with the control scheme, or add a few more.
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