diff --git a/wasp/boards/simulator/display.py b/wasp/boards/simulator/display.py
index bafb632..11b4701 100644
--- a/wasp/boards/simulator/display.py
+++ b/wasp/boards/simulator/display.py
@@ -89,7 +89,16 @@ class CST816SSim():
         else:
             self.regs[1] = 0
 
-    def handle_key(self, key):
+    def writeto_mem(self, addr, reg, buf, pins):
+        tick(pins)
+
+        if reg == 0xa5:
+            # This will be a sleep command... which we can ignore
+            return
+
+        raise OSError
+
+    def handle_key(self, key, pins):
         """Use key presses to provoke different touchscreen events.
 
         Note: The Down key provokes an upward swipe and vice versa.
@@ -107,16 +116,16 @@ class CST816SSim():
         elif key.keysym.sym == sdl2.SDLK_RIGHT:
             self.regs[1] = 3
         self.regs[3] = 0x80
-        self.raise_interrupt()
+        self.raise_interrupt(pins)
 
-    def handle_mousebutton(self, button):
+    def handle_mousebutton(self, button, pins):
         self.regs[1] = 5
         self.regs[4] = button.x
         self.regs[6] = button.y
-        self.raise_interrupt()
+        self.raise_interrupt(pins)
 
-    def raise_interrupt(self):
-        pass
+    def raise_interrupt(self, pins):
+        pins['TP_INT'].raise_irq()
 
 sdl2.ext.init()
 window = sdl2.ext.Window("ST7789", size=(WIDTH, HEIGHT))
@@ -134,12 +143,12 @@ def tick(pins):
             sdl2.ext.quit()
             sys.exit(0)
         elif event.type == sdl2.SDL_MOUSEBUTTONDOWN:
-            i2c_cst816s_sim.handle_mousebutton(event.button)
+            i2c_cst816s_sim.handle_mousebutton(event.button, pins)
         elif event.type == sdl2.SDL_KEYDOWN:
             if event.key.keysym.sym == sdl2.SDLK_TAB:
                 pins['BUTTON'].value(0)
             else:
-                i2c_cst816s_sim.handle_key(event.key)
+                i2c_cst816s_sim.handle_key(event.key, pins)
         elif event.type == sdl2.SDL_KEYUP:
             if event.key.keysym.sym == sdl2.SDLK_TAB:
                 pins['BUTTON'].value(1)
diff --git a/wasp/boards/simulator/machine.py b/wasp/boards/simulator/machine.py
index 1a5cf46..891b635 100644
--- a/wasp/boards/simulator/machine.py
+++ b/wasp/boards/simulator/machine.py
@@ -19,6 +19,7 @@ class ADC(Tracer):
 class Pin(object):
     IN = 'IN'
     OUT = 'OUT'
+    IRQ_FALLING = 'IRQ_FALLING'
 
     pins = {}
 
@@ -30,6 +31,9 @@ class Pin(object):
         # Update the pin registry
         self.pins[id] = self
 
+    def irq(self, trigger, handler):
+        self._handler = handler
+
     def init(self, d, value):
         self.value(value)
 
@@ -39,6 +43,9 @@ class Pin(object):
     def off(self):
         self.value(0)
 
+    def raise_irq(self):
+        self._handler(self)
+
     def value(self, v=None):
         if v is None:
             if not self._quiet:
@@ -90,6 +97,12 @@ class I2C():
         else:
             raise OSError
 
+    def writeto_mem(self, addr, reg, dbuf):
+        if self.sim:
+            self.sim.writeto_mem(addr, reg, dbuf, Pin.pins)
+        else:
+            raise OSError
+
 class Timer():
     def __init__(self, id, period=1000000):
         self.then = None
diff --git a/wasp/boards/simulator/watch.py b/wasp/boards/simulator/watch.py
index b9de73d..c6dafc3 100644
--- a/wasp/boards/simulator/watch.py
+++ b/wasp/boards/simulator/watch.py
@@ -131,6 +131,6 @@ accel = Accelerometer()
 battery = Battery()
 button = Pin('BUTTON', Pin.IN, quiet=True)
 rtc = RTC()
-touch = CST816S(I2C(0))
+touch = CST816S(I2C(0), Pin('TP_INT', Pin.IN, quiet=True), Pin('TP_RST', Pin.OUT, quiet=True))
 vibrator = Vibrator(Pin('MOTOR', Pin.OUT, value=0), active_low=True)