Initial Commit with everything done

Project 5/Memory.hdl

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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/Memory.hdl
+
+/**
+ * The complete address space of the Hack computer's memory,
+ * including RAM and memory-mapped I/O. 
+ * The chip facilitates read and write operations, as follows:
+ *     Read:  out(t) = Memory[address(t)](t)
+ *     Write: if load(t-1) then Memory[address(t-1)](t) = in(t-1)
+ * In words: the chip always outputs the value stored at the memory 
+ * location specified by address. If load==1, the in value is loaded 
+ * into the memory location specified by address. This value becomes 
+ * available through the out output from the next time step onward.
+ * Address space rules:
+ * Only the upper 16K+8K+1 words of the Memory chip are used. 
+ * Access to address>0x6000 is invalid. Access to any address in 
+ * the range 0x4000-0x5FFF results in accessing the screen memory 
+ * map. Access to address 0x6000 results in accessing the keyboard 
+ * memory map. The behavior in these addresses is described in the 
+ * Screen and Keyboard chip specifications given in the book.
+ */
+
+CHIP Memory {
+    IN in[16], load, address[15];
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+    DMux(in=load,sel=address[14],a=a,b=b);
+    DMux(in=b,sel=address[13],a=c,b=d);
+    RAM16K(in=in,load=a,address[0..13]=address[0..13],out=out1);
+    Screen(in=in,load=c,address[0..12]=address[0..12],out=out2);
+    Keyboard(out=out3);
+    Mux16(a=out2,b=out3,sel=address[13],out=out4);
+    Mux16(a=out1,b=out4,sel=address[14],out=out);
+}