Disassemble the final English debug ROM

home/map.asm

@@ -1138,7 +1138,7 @@ MaskObject::
 	ld d, $0
 	ld hl, wObjectMasks
 	add hl, de
-	ld [hl], -1 ; , masked
+	ld [hl], -1 ; masked
 	ret
 
 UnmaskObject::
@@ -1150,6 +1150,28 @@ UnmaskObject::
 	ld [hl], 0 ; unmasked
 	ret
 
+if DEF(_DEBUG)
+ComputeROMXChecksum::
+	ldh a, [hROMBank]
+	push af
+	ld a, c
+	rst Bankswitch
+	ld hl, $4000 ; ROMX start
+.loop
+	ld a, [hli]
+	add e
+	ld e, a
+	ld a, d
+	adc 0
+	ld d, a
+	ld a, h
+	cp $80 ; HIGH(ROMX end)
+	jr c, .loop
+	pop af
+	rst Bankswitch
+	ret
+endc
+
 ScrollMapUp::
 	hlcoord 0, 0
 	ld de, wBGMapBuffer