The location of the buttons for debug are misplaced

[takamin]

Though the buttons of stop/start and step are located near of the reset button, but those should be near of the assemble list at the right pane. The list has a feature to set break-points and they are used to debug the emulator.

It's inconvenient that the buttons were disappeared after certain time is past when debugging.
And essentially, those buttons are not peripherals of real MZ-700.