diff --git a/src/libsys/sys.inc b/src/libsys/sys.inc
new file mode 100644
index 0000000..53c2666
--- /dev/null
+++ b/src/libsys/sys.inc
@@ -0,0 +1,2 @@
+%define SYS_GIVEUP 0x100
+%define SYS_INT 0x80