diff --git a/irom_stub/irom_stub.asm b/irom_stub/irom_stub.asm
index 60f9310..8e148a4 100644
--- a/irom_stub/irom_stub.asm
+++ b/irom_stub/irom_stub.asm
@@ -52,6 +52,12 @@ _start:
     cld
     push cs
     pop ds
+
+    in al, 0A0h
+    ; Bit 2 - 1 = cart using 16bit data bus
+    or al, 004h
+    out 0A0h, al
+
     xor ax, ax
     mov es, ax
 
diff --git a/irom_stub/wc_irom.bin b/irom_stub/wc_irom.bin
index 4e0b5aa..ab20b96 100644
Binary files a/irom_stub/wc_irom.bin and b/irom_stub/wc_irom.bin differ
diff --git a/irom_stub/ws_irom.bin b/irom_stub/ws_irom.bin
index 5e44ed5..51fa6fb 100644
Binary files a/irom_stub/ws_irom.bin and b/irom_stub/ws_irom.bin differ
diff --git a/irom_stub/wsc_irom.bin b/irom_stub/wsc_irom.bin
index 21d04e8..02f86f7 100644
Binary files a/irom_stub/wsc_irom.bin and b/irom_stub/wsc_irom.bin differ