diff --git a/b/test.c b/b/test.c
new file mode 100644
index 0000000..79b3793
--- /dev/null
+++ b/b/test.c
@@ -0,0 +1,33 @@
+#define __LIBRARY__
+#include<stdio.h>
+#include<unistd.h>
+#include<errno.h>
+#include <stdlib.h>
+#include <assert.h>
+#define vga_graph_memstart 0xA0000
+#define vga_graph_memsize 64000
+#define cursor_side 6
+#define vga_width 320
+#define vga_height 200
+
+int i, j, x_pos = 20, y_pos = 20;
+char* p = vga_graph_memstart;
+
+_always_inline _syscall0(int, init_graphics)
+
+void test_graphics() {
+	init_graphics();
+	for (i = 0; i < vga_graph_memsize; i++)
+		*p++ = 3;
+	for (i = x_pos - cursor_side; i <= x_pos + cursor_side; i++)
+		for (j = y_pos - cursor_side; j <= y_pos + cursor_side; j++)
+		{
+			p = (char*)vga_graph_memstart + j * vga_width + i;
+			*p = 12;
+		}
+}
+int main(void)
+{
+	test_graphics();
+	return 0;
+}