diff --git a/Binary/MBC_ddw.upd b/Binary/MBC_ddw.upd
new file mode 100644
index 00000000..7b50e279
Binary files /dev/null and b/Binary/MBC_ddw.upd differ
diff --git a/Source/HBIOS/MBC_ddw.upd b/Source/HBIOS/MBC_ddw.upd
new file mode 100644
index 00000000..7b50e279
Binary files /dev/null and b/Source/HBIOS/MBC_ddw.upd differ
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 31d104e6..5c314477 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -127,6 +127,15 @@ TMS_INIT:
 	OUT	(TMS_ACR),A		; INIT AUX CONTROL REG
 #ENDIF
 ;
+
+#IF ((TMSMODE == TMSMODE_MBC))
+	TMS_IODELAY
+	TMS_IODELAY
+	LD	A,$FE
+	OUT	(TMS_ACR),A		; INIT AUX CONTROL REG
+#ENDIF
+
+
 	LD	IY,TMS_IDAT		; POINTER TO INSTANCE DATA
 ;
 	CALL	NEWLINE			; FORMATTING