diff --git a/kemonohook/hooks.c b/kemonohook/hooks.c
index 51fc0d0..bdce643 100644
--- a/kemonohook/hooks.c
+++ b/kemonohook/hooks.c
@@ -21,6 +21,12 @@ static const struct hook_symbol kemono_kernel32_syms[] = {
 };
 
 void kemono_extra_hooks_init(){
+    HMODULE serialportapi = LoadLibraryA("Parade_Data/Plugins/SerialPortAPI.dll"); // HACK??
+    if (serialportapi != NULL){
+        iohook_apply_hooks(serialportapi);
+        serial_hook_apply_hooks(serialportapi);
+        dprintf("Kemono: Successfully pre-loaded SerialPortAPI\n");
+    }
 }
 
 void kemono_extra_hooks_load(HMODULE mod, const wchar_t* target_module) {
diff --git a/kemonohook/jvs.c b/kemonohook/jvs.c
index ae9f0f8..0b10d3c 100644
--- a/kemonohook/jvs.c
+++ b/kemonohook/jvs.c
@@ -25,10 +25,12 @@ static void kemono_jvs_read_coin_counter(
         void *ctx,
         uint8_t slot_no,
         uint16_t *out);
+static void kemono_jvs_write_gpio(void *ctx, uint32_t state);
 
 static const struct io3_ops kemono_jvs_io3_ops = {
     .read_switches      = kemono_jvs_read_switches,
     .read_coin_counter  = kemono_jvs_read_coin_counter,
+    .write_gpio         = kemono_jvs_write_gpio
 };
 
 static struct io3 kemono_jvs_io3;
@@ -131,3 +133,7 @@ static void kemono_jvs_read_coin_counter(
 
     kemono_dll.jvs_read_coin_counter(out);
 }
+
+static void kemono_jvs_write_gpio(void *ctx, uint32_t state){
+    kemono_dll.jvs_write_gpio(state);
+}
\ No newline at end of file
diff --git a/kemonohook/kemono-dll.c b/kemonohook/kemono-dll.c
index 8fbb447..004cf50 100644
--- a/kemonohook/kemono-dll.c
+++ b/kemonohook/kemono-dll.c
@@ -28,6 +28,10 @@ const struct dll_bind_sym kemono_dll_syms[] = {
         {
                 .sym = "kemono_io_led_set_colors",
                 .off = offsetof(struct kemono_dll, led_set_leds),
+        },
+        {
+                .sym = "kemono_io_jvs_write_gpio",
+                .off = offsetof(struct kemono_dll, jvs_write_gpio),
         }
 };
 
diff --git a/kemonohook/kemono-dll.h b/kemonohook/kemono-dll.h
index 3ab7506..df676f0 100644
--- a/kemonohook/kemono-dll.h
+++ b/kemonohook/kemono-dll.h
@@ -16,6 +16,8 @@ struct kemono_dll {
     HRESULT (*led_init)(void);
 
     void (*led_set_leds)(uint8_t board, uint8_t *rgb);
+
+    void (*jvs_write_gpio)(uint32_t state);
 };
 
 struct kemono_dll_config {
diff --git a/kemonohook/kemonohook.def b/kemonohook/kemonohook.def
index c28d512..601a00b 100644
--- a/kemonohook/kemonohook.def
+++ b/kemonohook/kemonohook.def
@@ -17,6 +17,7 @@ EXPORTS
     kemono_io_poll
     kemono_io_led_init
     kemono_io_led_set_colors
+    kemono_io_jvs_write_gpio
     fwdlusb_open
     fwdlusb_close
     fwdlusb_listupPrinter
diff --git a/kemonoio/kemonoio.c b/kemonoio/kemonoio.c
index 8d4033c..5b24c28 100644
--- a/kemonoio/kemonoio.c
+++ b/kemonoio/kemonoio.c
@@ -3,6 +3,7 @@
 #include <limits.h>
 #include <stdint.h>
 #include <assert.h>
+#include <util/dprintf.h>
 
 #include "kemonoio/kemonoio.h"
 #include "kemonoio/config.h"
@@ -101,4 +102,8 @@ HRESULT kemono_io_led_init(void) {
 
 void kemono_io_led_set_colors(uint8_t board, uint8_t *rgb) {
 
+}
+
+void kemono_io_jvs_write_gpio(uint32_t state){
+
 }
\ No newline at end of file
diff --git a/kemonoio/kemonoio.h b/kemonoio/kemonoio.h
index 5969158..3b180e2 100644
--- a/kemonoio/kemonoio.h
+++ b/kemonoio/kemonoio.h
@@ -57,10 +57,25 @@ void kemono_io_jvs_read_coin_counter(uint16_t *out);
 
    All subsequent calls may originate from arbitrary threads and some may
    overlap with each other. Ensuring synchronization inside your IO DLL is
-   your responsibility. */
+   your responsibility.
+
+   Minimum API version: 0x0100 */
 HRESULT kemono_io_led_init(void);
 
 /* Update the RGB LEDs.
 
-   Exact layout is TBD. */
-void kemono_io_led_set_colors(uint8_t board, uint8_t *rgb);
\ No newline at end of file
+    The left side LED bar are indices 0 to 32.
+    The right side LED bar are indices 33 to 65.
+
+    Minimum API version: 0x0100 */
+void kemono_io_led_set_colors(uint8_t board, uint8_t *rgb);
+
+/* Update the button LEDs.
+
+    Button R: Bit 15
+    Button G: Bit 1
+    Button B: Bit 13
+    Start Button: Bit 11
+
+    Minimum API version: 0x0100 */
+void kemono_io_jvs_write_gpio(uint32_t state);
\ No newline at end of file