diff --git a/src/boot.c b/src/boot.c
index 128e79c..20767f5 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -10,9 +10,13 @@ void __eabi(void)
 {
 }
 
+//void* ofw_interpret(char* cmd, int32_t* stack_args, int n_stack_args, int n_ret_args, int32_t* reta
 void main(void)
 {
+	puts("ABCD", 4);
 	ofw_interpret("blink-screen", 0, 0, 0, 0);
+
+	ofw_interpret("key", 0, 0, 1, (int32_t*)0x03020000);
 	if (ofw_test("open"))
 	{
 		asm("mr 27, 28");
diff --git a/src/lib/common.c b/src/lib/common.c
new file mode 100644
index 0000000..1382c1c
--- /dev/null
+++ b/src/lib/common.c
@@ -0,0 +1,16 @@
+#include <ofw.h>
+
+void puts(char* str, int len)
+{
+	char cmd[len+8]; 
+	cmd[0] = '.'; cmd[1] = '"';
+	cmd[2] = ' ';
+	for (int i = 3; i < len+3; i++)
+	{
+		cmd[i] = str[i-3];
+	}
+	cmd[len+3] = '"'; cmd[len+4] = ' ';
+	cmd[len+5] = 'c'; cmd[len+6] = 'r';
+	cmd[len+7] = 0;
+	ofw_interpret(cmd, 0, 0, 0, 0);
+}