> Which key replaces the old Scroll Lock function in notebooks that has no Scroll Lock > key? It's needed for switching between natural and emulated keyboards in old > computers and I can't do that in my new notebook.
You can change the mapping in the TAB -> Input (general) -> Ui Toggle to whatever you want. You can also start MAME with UI Active by starting MAME --> Configure Options --> Advanced Options --> Look for "Input Option" area and there should be "UI Enable". Toggle this ON and it will start emulation as it does with non-keyboard machines.