diff --git a/artiq/devices/runtime.py b/artiq/devices/runtime.py
index 2563abb12..3b9330201 100644
--- a/artiq/devices/runtime.py
+++ b/artiq/devices/runtime.py
@@ -5,7 +5,8 @@ lt.initialize_all()
 
 _syscalls = [
 	("rpc",			"i+:i"),
-	("gpio_set",	"ii:v")
+	("gpio_set",	"ii:v"),
+	("rtio_set",	"iii:v")
 ]
 
 def _str_to_functype(s):
diff --git a/artiq/devices/ttl_core.py b/artiq/devices/ttl_core.py
new file mode 100644
index 000000000..eda921c1d
--- /dev/null
+++ b/artiq/devices/ttl_core.py
@@ -0,0 +1,10 @@
+from artiq.language.core import *
+
+class TTLOut(MPO):
+	parameters = "channel"
+
+	@kernel
+	def pulse(self, duration):
+		syscall("rtio_set", now(), self.channel, 1)
+		delay(duration)
+		syscall("rtio_set", now(), self.channel, 0)