From a000308104aab27c2dde9a306f1bc654b2db4806 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Wed, 29 Nov 2017 12:30:41 +0100
Subject: first commit

---
 projects/12/Sys.jack | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 projects/12/Sys.jack

(limited to 'projects/12/Sys.jack')

diff --git a/projects/12/Sys.jack b/projects/12/Sys.jack
new file mode 100644
index 0000000..bee6f67
--- /dev/null
+++ b/projects/12/Sys.jack
@@ -0,0 +1,27 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/12/Sys.jack
+
+/**
+ * A library that supports various program execution services.
+ */
+class Sys {
+
+    /** Performs all the initializations required by the OS. */
+    function void init() {
+    }
+
+    /** Halts the program execution. */
+    function void halt() {
+    }
+
+    /** Waits approximately duration milliseconds and returns.  */
+    function void wait(int duration) {
+    }
+
+    /** Displays the given error code in the form "ERR<errorCode>",
+     *  and halts the program's execution. */
+    function void error(int errorCode) {
+    }
+}
-- 
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