rom0
	org $4000 ; OK
	org $4001 ; Nope

romx 1
	org $3FFF ; Nope
	org $8000 ; OK
	org $8001 ; Nope

hram
	org 0 ; Nope
	org $FF7F ; Nope
	org $FF80 ; OK
	org $FFFF ; OK
	org $10000 ; Nope