diff --git a/src/main/iidxhook-util/acio.c b/src/main/iidxhook-util/acio.c
index df34606..7b5b442 100644
--- a/src/main/iidxhook-util/acio.c
+++ b/src/main/iidxhook-util/acio.c
@@ -30,6 +30,16 @@
 static struct ac_io_emu iidxhook_util_acio_emu;
 static struct ac_io_emu_icca iidxhook_util_acio_emu_icca[2];
 
+static bool iidxhook_util_icca_override_version;
+static enum ac_io_emu_icca_version iidxhook_util_icca_override_version_value;
+
+
+void iidxhook_util_acio_override_version(enum ac_io_emu_icca_version version)
+{
+    iidxhook_util_icca_override_version = true;
+    iidxhook_util_icca_override_version_value = version;
+}
+
 void iidxhook_util_acio_init(bool legacy_mode)
 {
     uint8_t i;
@@ -43,6 +53,12 @@ void iidxhook_util_acio_init(bool legacy_mode)
     for (i = 0; i < lengthof(iidxhook_util_acio_emu_icca); i++) {
         ac_io_emu_icca_init(
             &iidxhook_util_acio_emu_icca[i], &iidxhook_util_acio_emu, i);
+        if (iidxhook_util_icca_override_version) {
+            ac_io_emu_icca_set_version(
+                &iidxhook_util_acio_emu_icca[i],
+                iidxhook_util_icca_override_version_value
+            );
+        }
     }
 
     rs232_hook_add_fd(iidxhook_util_acio_emu.fd);
diff --git a/src/main/iidxhook-util/acio.h b/src/main/iidxhook-util/acio.h
index bfcd900..1a7d204 100644
--- a/src/main/iidxhook-util/acio.h
+++ b/src/main/iidxhook-util/acio.h
@@ -5,6 +5,7 @@
 
 #include <stdbool.h>
 
+#include "acioemu/icca.h"
 #include "hook/iohook.h"
 
 /**
@@ -19,6 +20,12 @@
  */
 void iidxhook_util_acio_init(bool legacy_mode);
 
+
+/**
+ * Use the specified ICCA emulation version
+ */
+void iidxhook_util_acio_override_version(enum ac_io_emu_icca_version version);
+
 /**
  * Cleanup the ACIO emulation layer.
  */