diff --git a/npc/CMakeLists.txt b/npc/CMakeLists.txt
index 880181b..9e27367 100644
--- a/npc/CMakeLists.txt
+++ b/npc/CMakeLists.txt
@@ -17,7 +17,7 @@ find_package(verilator REQUIRED)
 find_library(NVBOARD_LIBRARY NAMES nvboard)
 find_path(NVBOARD_INCLUDE_DIR NAMES nvboard.h)
 
-set(TOPMODULE "SegHandler")
+set(TOPMODULE "Keyboard")
 set(SCALA_CORE "${CMAKE_CURRENT_SOURCE_DIR}/core")
 set(CHISEL_MODULE_CLASS "${CMAKE_PROJECT_NAME}.${TOPMODULE}")
 file(GLOB_RECURSE SCALA_CORE_SOURCES "${SCALA_CORE}/src/main/scala/*.scala")
diff --git a/npc/csrc_nvboard/Keyboard/main.cpp b/npc/csrc_nvboard/Keyboard/main.cpp
new file mode 100644
index 0000000..d2f2a28
--- /dev/null
+++ b/npc/csrc_nvboard/Keyboard/main.cpp
@@ -0,0 +1,59 @@
+#include <cassert>
+#include <cstdlib>
+#include <nvboard.h>
+#include <verilated.h>
+#include <verilated_vcd_c.h>
+
+#ifndef VERILATOR_TOPMODULE
+#define VERILATOR_TOPMODULE VKeyboard
+#endif
+
+#define CLASS_SYSTEM_HEADER_NAME(name) CLASS_SYSTEM_HEADER_NAME_IMPL(name)
+#define CLASS_SYSTEM_HEADER_NAME_IMPL(name) <name.h>
+
+#include CLASS_SYSTEM_HEADER_NAME(VERILATOR_TOPMODULE)
+
+const int MAX_SIM_TIME = 100;
+int keycode = 0;
+
+template <class F> void cycle(VERILATOR_TOPMODULE *top, F &&f) {
+  top->clock = 0;
+  top->eval();
+  top->clock = 1;
+  top->eval();
+  f();
+}
+
+void nvboard_bind_all_pins(VERILATOR_TOPMODULE *top);
+
+static void single_cycle(VERILATOR_TOPMODULE *top) {
+  top->clock = 0;
+  top->eval();
+  top->clock = 1;
+  top->eval();
+}
+
+static void reset(VERILATOR_TOPMODULE *top, int n) {
+  top->reset = 1;
+  while (n-- > 0)
+    single_cycle(top);
+  top->reset = 0;
+}
+
+int main(int argc, char **argv, char **env) {
+  VERILATOR_TOPMODULE *top = new VERILATOR_TOPMODULE;
+
+  nvboard_bind_all_pins(top);
+  nvboard_init();
+  reset(top, 10);
+  while (true) {
+    nvboard_update();
+    cycle(top, [&] {
+      if (keycode != top->io_keycode_bits){
+        keycode = top->io_keycode_bits;
+        printf("%d\n", keycode);
+      }
+    });
+  }
+  delete top;
+}
\ No newline at end of file