When doing step X and an error is thrown, the UI is not updated to show the current state of the machine. It should be.

Currently when refreshing the page, step X is reset to 50 and step rate is set to 3.

These should be saved to localStorage so that user values are persisted.

Address 0-15 have names. It would be nice to use these in the display like the provided VM emulator does. Also do this for SCREEN and KBD

I didn't want to implement this initially, as I wanted to be able to push code before the assignment was due, but this would be very useful. When loading an asm file, the program should include comments.

Both the RAM and the ROM tables need a way to jump to a specific point. It is rather painful to try to scroll to a specific address.

This should be pretty simple, prompt() for input then set the scrollTop of the relevant element.

Like #4, it is reasonable to want to step until a given memory address is accessed and/or modified.

The more I use this the more I realize I want shortcuts similar to other debuggers.

Blocked by #2

M=-M should be displayed as M=-M, not as M=~M

It would have come in handy when testing the s2020 program:

while (machine.ram[16383] !== 4242) machine.step()
// want to call refreshScreen + refreshGui here

It would be really nice to be able to step to a certain PC value without calculating how many instructions need to be run and entering that in the Step X box, which might be next to impossible in the first place with nested loops.