diff --git a/mercuryhook/mercury-dll.h b/mercuryhook/mercury-dll.h
index b28b8ca..086fd92 100644
--- a/mercuryhook/mercury-dll.h
+++ b/mercuryhook/mercury-dll.h
@@ -11,7 +11,7 @@ struct mercury_dll {
     void (*get_opbtns)(uint8_t *opbtn);
     void (*get_gamebtns)(uint8_t *gamebtn);
     HRESULT (*touch_init)(void);
-    HRESULT (*touch_start)(void);
+    void (*touch_start)(mercury_io_touch_callback_t callback);
 };
 
 struct mercury_dll_config {
diff --git a/mercuryhook/touch.c b/mercuryhook/touch.c
index 6c0c942..a32f6a2 100644
--- a/mercuryhook/touch.c
+++ b/mercuryhook/touch.c
@@ -37,8 +37,12 @@ static HRESULT touch_handle_get_unit_board_ver(const struct touch_req *req);
 static HRESULT touch_handle_mystery1(const struct touch_req *req);
 static HRESULT touch_handle_mystery2(const struct touch_req *req);
 static HRESULT touch_handle_start_auto_scan(const struct touch_req *req);
+static void touch_res_auto_scan(const uint8_t *state);
 
-uint8_t input_frame_count = 0x7b;
+uint8_t input_frame_count_0 = 0x7b;
+uint8_t input_frame_count_1 = 0x7b;
+bool touch0_auto = false;
+bool touch1_auto = false;
 
 static CRITICAL_SECTION touch0_lock;
 static struct uart touch0_uart;
@@ -235,6 +239,8 @@ static HRESULT touch_handle_get_sync_board_ver(const struct touch_req *req)
     // TODO: Why does strcpy_s here give a runtime warning and not work????
     //strcpy_s(resp.version, sizeof(resp.version), "190523");
     memcpy(resp.version, sync_board_ver, sizeof(sync_board_ver));
+    resp.checksum = 0;
+    resp.checksum = calc_checksum(&resp, sizeof(resp));
 
 
     if (req->side == 0) {
@@ -290,6 +296,8 @@ static HRESULT touch_handle_startup(const struct touch_req *req)
     }
 
     memcpy(resp.data, rev, 80 * sizeof(uint8_t));
+    resp.checksum = 0;
+    resp.checksum = calc_checksum(&resp, sizeof(resp));
 
     if (req->side == 0) {
         hr = touch_frame_encode(&touch0_uart.readable, &resp, sizeof(resp));
@@ -313,6 +321,8 @@ static HRESULT touch_handle_get_unit_board_ver(const struct touch_req *req)
 
     resp.cmd = 0xa8;
     memcpy(resp.version, unit_board_ver, sizeof(unit_board_ver));
+    resp.checksum = 0;
+    resp.checksum = calc_checksum(&resp, sizeof(resp));
 
     if (req->side == 0) {
         hr = touch_frame_encode(&touch0_uart.readable, &resp, sizeof(resp));
@@ -333,6 +343,8 @@ static HRESULT touch_handle_mystery1(const struct touch_req *req)
 
     resp.cmd = 0xa2;
     resp.data = 0x3f;
+    resp.checksum = 0;
+    resp.checksum = calc_checksum(&resp, sizeof(resp));
 
     if (req->side == 0) {
         hr = touch_frame_encode(&touch0_uart.readable, &resp, sizeof(resp));
@@ -352,6 +364,8 @@ static HRESULT touch_handle_mystery2(const struct touch_req *req)
 
     resp.cmd = 0x94;
     resp.data = 0;
+    resp.checksum = 0;
+    resp.checksum = calc_checksum(&resp, sizeof(resp));
 
     if (req->side == 0) {
         hr = touch_frame_encode(&touch0_uart.readable, &resp, sizeof(resp));
@@ -376,20 +390,62 @@ static HRESULT touch_handle_start_auto_scan(const struct touch_req *req)
     resp.checksum = 0x49;
 
     resp.frame.cmd= 0x81;
-    resp.frame.count = input_frame_count++;
     memcpy(resp.frame.data1, data1, sizeof(data1));
     memcpy(resp.frame.data2, data2, sizeof(data2));
+    resp.frame.checksum = 0;
     resp.frame.checksum = calc_checksum(&resp.frame, sizeof(resp.frame));
 
     if (req->side == 0) {
+        resp.frame.count = input_frame_count_0++;
         hr = touch_frame_encode(&touch0_uart.readable, &resp, sizeof(resp));
+        touch0_auto = true;
     }
     else {
+        resp.frame.count = input_frame_count_1++;
         hr = touch_frame_encode(&touch1_uart.readable, &resp, sizeof(resp));
+        touch1_auto = true;
     }
+
+    //mercury_dll.touch_start(touch_res_auto_scan);
     return hr;
 }
 
+static void touch_res_auto_scan(const uint8_t *state)
+{
+    struct touch_input_frame frame0;
+    //struct touch_input_frame frame1;
+    uint8_t data1[24] = { 0 };
+    uint8_t data2[9] = { 0x0d, 0x03, 0x02, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00 };
+
+    frame0.cmd = 0x81;
+    if (input_frame_count_0 == 0x7f) {
+        frame0.count = 0x7f;
+        input_frame_count_0 = 0;
+    }
+    else {
+        frame0.count = input_frame_count_0++;
+    }
+    // for now return no data
+    memcpy(frame0.data1, data1, sizeof(data1));
+    memcpy(frame0.data2, data2, sizeof(data2));
+    frame0.checksum = 0;
+    frame0.checksum = calc_checksum(&frame0, sizeof(frame0));
+
+    if (touch0_auto) {
+        //dprintf("Wacca touch: Touch0 auto frame #%2hx sent\n", frame0.count);
+        EnterCriticalSection(&touch0_lock);
+        touch_frame_encode(&touch0_uart.readable, &frame0, sizeof(frame0));
+        LeaveCriticalSection(&touch0_lock);
+    }
+
+    if (touch1_auto) {
+        //dprintf("Wacca touch: Touch1 auto frame #%2hx sent\n", frame0.count);
+        EnterCriticalSection(&touch1_lock);
+        touch_frame_encode(&touch1_uart.readable, &frame0, sizeof(frame0));
+        LeaveCriticalSection(&touch1_lock);
+    }
+}
+
 /* Decodes the response into a struct that's easier to work with. */
 static HRESULT touch_frame_decode(struct touch_req *dest, struct iobuf *iobuf, int side)
 {
@@ -412,16 +468,13 @@ static HRESULT touch_frame_decode(struct touch_req *dest, struct iobuf *iobuf, i
 static HRESULT touch_frame_encode(struct iobuf *dest, const void *ptr, size_t nbytes)
 {
     const uint8_t *src;
-    uint8_t checksum = 0;
 
     src = ptr;
 
     for (size_t i = 0; i < nbytes; i++) {
         dest->bytes[dest->pos++] = src[i];
-        checksum = checksum^(src[i]);
     }
 
-    dest->bytes[dest->pos++] = checksum&0x7f;
     return S_OK;
 }
 
@@ -438,8 +491,9 @@ static uint8_t calc_checksum(const void *ptr, size_t nbytes)
     src = ptr;
 
     for (size_t i = 0; i < nbytes; i++) {
+        //dprintf("Wacca touch: Calculating %2hx\n", src[i]);
         checksum = checksum^(src[i]);
     }
-
+    //dprintf("Wacca touch: Checksum is %2hx\n", checksum&0x7f);
     return checksum&0x7f;
 }
diff --git a/mercuryhook/touch.h b/mercuryhook/touch.h
index 6e79375..d98fc0b 100644
--- a/mercuryhook/touch.h
+++ b/mercuryhook/touch.h
@@ -26,9 +26,6 @@ struct touch_req {
     uint8_t data_length; // Size of the data including command byte
 };
 
-// The checksum is only calculated when we're about to send it so
-// it's not part of any of these structs. Just note that the last
-// byte of every response is a checksum
 struct touch_input_frame {
     uint8_t cmd;
     uint8_t data1[24];
@@ -40,25 +37,30 @@ struct touch_input_frame {
 struct touch_resp_get_sync_board_ver {
     uint8_t cmd;
     char version[6];
+    uint8_t checksum;
 };
 
 struct touch_resp_startup {
     char data[80];
+    uint8_t checksum;
 };
 
 struct touch_resp_get_unit_board_ver {
     uint8_t cmd;
     uint8_t version[43];
+    uint8_t checksum;
 };
 
 struct touch_resp_mystery1 {
     uint8_t cmd;
     uint8_t data;
+    uint8_t checksum;
 };
 
 struct touch_resp_mystery2 {
     uint8_t cmd;
     uint8_t data;
+    uint8_t checksum;
 };
 
 struct touch_resp_start_auto {
diff --git a/mercuryio/mercuryio.c b/mercuryio/mercuryio.c
index e51daf4..3d4a735 100644
--- a/mercuryio/mercuryio.c
+++ b/mercuryio/mercuryio.c
@@ -2,13 +2,18 @@
 
 #include <limits.h>
 #include <stdint.h>
+#include <process.h>
 
 #include "mercuryio/mercuryio.h"
 #include "mercuryio/config.h"
 
+static unsigned int __stdcall mercury_io_touch_thread_proc(void *ctx);
+
 static uint8_t mercury_opbtn;
 static uint8_t mercury_gamebtn;
 static struct mercury_io_config mercury_io_cfg;
+static bool mercury_io_touch_stop_flag;
+static HANDLE mercury_io_touch_thread;
 
 uint16_t mercury_io_get_api_version(void)
 {
@@ -65,7 +70,42 @@ HRESULT mercury_io_touch_init(void)
     return S_OK;
 }
 
-HRESULT mercury_io_touch_start(void)
+void mercury_io_touch_start(mercury_io_touch_callback_t callback)
 {
-    return S_OK;
+    if (mercury_io_touch_thread != NULL) {
+        return;
+    }
+
+    mercury_io_touch_thread = (HANDLE) _beginthreadex(
+        NULL,
+        0,
+        mercury_io_touch_thread_proc,
+        callback,
+        0,
+        NULL
+    );
+}
+
+static unsigned int __stdcall mercury_io_touch_thread_proc(void *ctx)
+{
+    mercury_io_touch_callback_t callback;
+    uint8_t pressure[240];
+    size_t i;
+
+    callback = ctx;
+
+    while (!mercury_io_touch_stop_flag) {
+        for (i = 0 ; i < _countof(pressure) ; i++) {
+            if (GetAsyncKeyState(mercury_io_cfg.vk_cell[i]) & 0x8000) {
+                pressure[i] = 128;
+            } else {
+                pressure[i] = 0;
+            }
+        }
+
+        callback(pressure);
+        Sleep(1);
+    }
+
+    return 0;
 }
diff --git a/mercuryio/mercuryio.h b/mercuryio/mercuryio.h
index 07d14e3..6f32989 100644
--- a/mercuryio/mercuryio.h
+++ b/mercuryio/mercuryio.h
@@ -14,6 +14,7 @@ enum {
     MERCURY_IO_GAMEBTN_VOL_DOWN = 0x02,
 };
 
+typedef void (*mercury_io_touch_callback_t)(const uint8_t *state);
 /* Get the version of the Wacca IO API that this DLL supports. This
    function should return a positive 16-bit integer, where the high byte is
    the major version and the low byte is the minor version (as defined by the
@@ -61,4 +62,4 @@ void mercury_io_get_gamebtns(uint8_t *gamebtn);
 
 HRESULT mercury_io_touch_init(void);
 
-HRESULT mercury_io_touch_start(void);
+void mercury_io_touch_start(mercury_io_touch_callback_t callback);