4 files changed, 141 insertions, 0 deletions
diff --git a/projects/04/mult/Mult.asm b/projects/04/mult/Mult.asm
new file mode 100644
index 0000000..f84ce79
--- /dev/null
+++ b/projects/04/mult/Mult.asm
@@ -0,0 +1,53 @@
+// 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/04/Mult.asm
+
+// Multiplies R0 and R1 and stores the result in R2.
+// (R0, R1, R2 refer to RAM[0], RAM[1], and RAM[2], respectively.)
+//
+// This program only needs to handle arguments that satisfy
+// R0 >= 0, R1 >= 0, and R0*R1 < 32768.
+
+// Put your code here.
+@acc
+M=0	// acc = 0
+
+@R0
+D=M
+@a
+M=D	// a = RAM[0]
+@WRITE
+D;JEQ	// if (a == 0) goto WRITE
+
+@R1
+D=M
+@b
+M=D	// b = RAM[1]
+@WRITE
+D;JEQ	// if (b == 0) goto WRITE
+
+(LOOP)
+	@b
+	D=M
+	@acc
+	M=M+D	// acc += b
+	@a
+	M=M-1	// a--
+	D=M
+	@WRITE
+	D;JEQ	// if (a == 0) goto WRITE
+	@LOOP
+	0;JMP	// goto LOOP
+
+(WRITE)
+	@acc
+	D=M
+	@R2
+	M=D	// RAM[2] = acc
+	@END
+	0;JMP	// goto END
+
+(END)
+	@END
+	0;JMP
diff --git a/projects/04/mult/Mult.cmp b/projects/04/mult/Mult.cmp
new file mode 100644
index 0000000..296b5fb
--- /dev/null
+++ b/projects/04/mult/Mult.cmp
@@ -0,0 +1,7 @@
+|  RAM[0]  |  RAM[1]  |  RAM[2]  |
+|       0  |       0  |       0  |
+|       1  |       0  |       0  |
+|       0  |       2  |       0  |
+|       3  |       1  |       3  |
+|       2  |       4  |       8  |
+|       6  |       7  |      42  |
+\ No newline at end of file
diff --git a/projects/04/mult/Mult.out b/projects/04/mult/Mult.out
new file mode 100644
index 0000000..e31b5df
--- /dev/null
+++ b/projects/04/mult/Mult.out
@@ -0,0 +1,7 @@
+|  RAM[0]  |  RAM[1]  |  RAM[2]  |
+|       0  |       0  |       0  |
+|       1  |       0  |       0  |
+|       0  |       2  |       0  |
+|       3  |       1  |       3  |
+|       2  |       4  |       8  |
+|       6  |       7  |      42  |
diff --git a/projects/04/mult/Mult.tst b/projects/04/mult/Mult.tst
new file mode 100644
index 0000000..9bf4fa8
--- /dev/null
+++ b/projects/04/mult/Mult.tst
@@ -0,0 +1,74 @@
+// 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/04/mult/Mult.tst
+
+load Mult.asm,
+output-file Mult.out,
+compare-to Mult.cmp,
+output-list RAM[0]%D2.6.2 RAM[1]%D2.6.2 RAM[2]%D2.6.2;
+
+set RAM[0] 0,   // Set test arguments
+set RAM[1] 0,
+set RAM[2] -1;  // Test that program initialized product to 0
+repeat 20 {
+  ticktock;
+}
+set RAM[0] 0,   // Restore arguments in case program used them as loop counter
+set RAM[1] 0,
+output;
+
+set PC 0,
+set RAM[0] 1,   // Set test arguments
+set RAM[1] 0,
+set RAM[2] -1;  // Ensure that program initialized product to 0
+repeat 50 {
+  ticktock;
+}
+set RAM[0] 1,   // Restore arguments in case program used them as loop counter
+set RAM[1] 0,
+output;
+
+set PC 0,
+set RAM[0] 0,   // Set test arguments
+set RAM[1] 2,
+set RAM[2] -1;  // Ensure that program initialized product to 0
+repeat 80 {
+  ticktock;
+}
+set RAM[0] 0,   // Restore arguments in case program used them as loop counter
+set RAM[1] 2,
+output;
+
+set PC 0,
+set RAM[0] 3,   // Set test arguments
+set RAM[1] 1,
+set RAM[2] -1;  // Ensure that program initialized product to 0
+repeat 120 {
+  ticktock;
+}
+set RAM[0] 3,   // Restore arguments in case program used them as loop counter
+set RAM[1] 1,
+output;
+
+set PC 0,
+set RAM[0] 2,   // Set test arguments
+set RAM[1] 4,
+set RAM[2] -1;  // Ensure that program initialized product to 0
+repeat 150 {
+  ticktock;
+}
+set RAM[0] 2,   // Restore arguments in case program used them as loop counter
+set RAM[1] 4,
+output;
+
+set PC 0,
+set RAM[0] 6,   // Set test arguments
+set RAM[1] 7,
+set RAM[2] -1;  // Ensure that program initialized product to 0
+repeat 210 {
+  ticktock;
+}
+set RAM[0] 6,   // Restore arguments in case program used them as loop counter
+set RAM[1] 7,
+output;