filesel -d "Please select a TNES ROM." 0:/* SELROM
cp $[SELROM] 0:/gm9/out/TNES_BACKUP
fset $[SELROM] 4E45531A #NES[1A]
fset $[SELROM]@7 00
fget $[SELROM]@4:1 MBYTE
fget $[SELROM]@9:1 BATTERY
if chk $[BATTERY] 01
	echo "Your game appears to have a battery.\nYou will have to fix this manually."
end
fget $[SELROM]@5:1 PRGSIZE
fget $[SELROM]@6:1 CHRSIZE
fget $[SELROM]@8:1 MIRRORING
fset $[SELROM]@5 $[CHRSIZE]
# Mapper

if chk $[MIRRORING] 00
# 	goto Mirroring_Set
	@mirrorloop
	labelsel -o -s "Choose a mirroring type. (If unsure, try at random)" Mirroring_*
	goto mirrorloop
end
goto Modify_Mapper

@Mirroring_Horizontal
set MIRRORING 01
goto Modify_Mapper

@Mirroring_Vertical
set MIRRORING 02
goto Modify_Mapper

@Modify_Mapper
if chk $[MBYTE] 00
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 00
	else
		fset $[SELROM]@6 01
	end
elif chk $[MBYTE] 01
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 10
	else
		fset $[SELROM]@6 11
	end
elif chk $[MBYTE] 02
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 90
	else
		fset $[SELROM]@6 91
	end
elif chk $[MBYTE] 03
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 40
	else
		fset $[SELROM]@6 41
	end
elif chk $[MBYTE] 04
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 A0
	else
		fset $[SELROM]@6 A1
	end
elif chk $[MBYTE] 05
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 50
	else
		fset $[SELROM]@6 51
	end
elif chk $[MBYTE] 06
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 20
	else
		fset $[SELROM]@6 21
	end
elif chk $[MBYTE] 07
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 30
	else
		fset $[SELROM]@6 31
	end
elif chk $[MBYTE] 09
	if chk $[MIRRORING] 01
		fset $[SELROM]@6 70
	else
		fset $[SELROM]@6 71
	end
elif chk $[MBYTE] 64
	echo "FDS ROM detected, this script does not work with FDS."
	reboot
else
	echo "Unknown mapper format."
	reboot
end
# PRG ROM Size
if chk $[PRGSIZE] 02
	fset $[SELROM]@4 01
elif chk $[PRGSIZE] 04
	fset $[SELROM]@4 02
elif chk $[PRGSIZE] 06
	fset $[SELROM]@4 03
elif chk $[PRGSIZE] 08
	fset $[SELROM]@4 04
elif chk $[PRGSIZE] 0A
	fset $[SELROM]@4 05
elif chk $[PRGSIZE] 0C
	fset $[SELROM]@4 06
elif chk $[PRGSIZE] 0E
	fset $[SELROM]@4 07
elif chk $[PRGSIZE] 10
	fset $[SELROM]@4 08
elif chk $[PRGSIZE] 12
	fset $[SELROM]@4 09
elif chk $[PRGSIZE] 14
	fset $[SELROM]@4 0A
elif chk $[PRGSIZE] 16
	fset $[SELROM]@4 0B
elif chk $[PRGSIZE] 18
	fset $[SELROM]@4 0C
elif chk $[PRGSIZE] 1A
	fset $[SELROM]@4 0D
elif chk $[PRGSIZE] 1C
	fset $[SELROM]@4 0E
elif chk $[PRGSIZE] 1E
	fset $[SELROM]@4 0F
elif chk $[PRGSIZE] 20
	fset $[SELROM]@4 10
else
	echo "The PRGROM size is abnormal.\nPlease fix this manually.\nFor reference, its current size is $[PRGSIZE]."
end