This is how it was done in the old days.
Before the arrival of Emulators and Cross-Assemblers.

The seemingly nonsensicle
	FOR i = 0 TO 16383
	POKE i, PEEK i
	NEXT i

did the trick with the right switch settings and copied the ROM software sideways into RAM.

The four switches are left to right
	WD/WE With WD, POKE pokes to ROM, with WE pokes to RAM.
	SOFT/NORM With NORM, PEEK and theProgram Counter read from ROM. With SOFT, PEEK and the PC read from RAM.
	RESET - a non destructive reset activates RST 0.
	NMI - a debounced NMI switch.
	
Of course the NMI switch just did a reset unless you POKED Ram to alter the logic.