diff --git a/nac3embedded/demo.py b/nac3embedded/demo.py
index 532c623..a558178 100644
--- a/nac3embedded/demo.py
+++ b/nac3embedded/demo.py
@@ -2,6 +2,21 @@ from language import *
 from numpy import int32, int64
 
 
+@syscall
+def now_mu() -> int64:
+    raise NotImplementedError("syscall not simulated")
+
+
+@syscall
+def at_mu(t: int64):
+    raise NotImplementedError("syscall not simulated")
+
+
+@syscall
+def delay_mu(dt: int64):
+    raise NotImplementedError("syscall not simulated")
+
+
 @syscall
 def rtio_init():
     raise NotImplementedError("syscall not simulated")
@@ -26,11 +41,27 @@ def rtio_input_timestamp(timeout_mu: int64, channel: int32) -> int64:
 def rtio_input_data(channel: int32) -> int32:
     raise NotImplementedError("syscall not simulated")
 
+@kernel
+class Core:
+    @kernel
+    def reset(self):
+        rtio_init()
+        at_mu(rtio_get_counter() + int64(125000))
+
+    @kernel
+    def break_realtime(self):
+        min_now = rtio_get_counter() + int64(125000)
+        if now_mu() < min_now:
+            at_mu(min_now)
+
 
 @kernel
 class Demo:
     @kernel
     def run(self):
+        core = Core()
+
+        core.reset()
         rtio_init()