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+// 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/05/ComputerAdd-external.tst
+
+load Computer.hdl,
+output-file ComputerAdd-external.out,
+compare-to ComputerAdd-external.cmp,
+output-list time%S1.4.1 reset%B2.1.2 RAM16K[0]%D1.7.1 RAM16K[1]%D1.7.1 RAM16K[2]%D1.7.1;
+
+// Load a program written in the Hack machine language.
+// The program adds the two constants 2 and 3 and writes the result in RAM[0]. 
+ROM32K load Add.hack,
+output;
+
+// First run (at the beginning PC=0)
+repeat 6 {
+    tick, tock, output;
+}
+
+// Reset the PC
+set reset 1,
+set RAM16K[0] 0,
+tick, tock, output;
+
+
+// Second run, to check that the PC was reset correctly.
+set reset 0,
+
+repeat 6 {
+    tick, tock, output;
+}