From 10ef9e6d3479415934816b74b7d5c3ca5fca1071 Mon Sep 17 00:00:00 2001
From: Jonas <jonas@jjsoftware.dk>
Date: Tue, 10 Feb 2026 22:25:41 +0100
Subject: [PATCH] feat: cpu, memory, computer hdl

---
 .../computer-architecture.pdf                 | Bin 628416 -> 633728 bytes
 project-5-computer-architecture/hdl/CPU.hdl   |  47 ++++++++++++++++--
 .../hdl/Computer.hdl                          |  44 ++++++++++++++++
 3 files changed, 86 insertions(+), 5 deletions(-)
 create mode 100644 project-5-computer-architecture/hdl/Computer.hdl

diff --git a/project-5-computer-architecture/computer-architecture.pdf b/project-5-computer-architecture/computer-architecture.pdf
index 4c2dac9d4473ff7cc4bd747cf9363f112e8d6766..afdc8f0c91ad4bf7f64be9bdd72a38c3e85a83d3 100644
GIT binary patch
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delta 27
icmZp;u6AIpT0;wC3sVbo3rh=Y3tJ0&3&$4D1JeMKa|!4G

diff --git a/project-5-computer-architecture/hdl/CPU.hdl b/project-5-computer-architecture/hdl/CPU.hdl
index 51e667b..3e97baf 100644
--- a/project-5-computer-architecture/hdl/CPU.hdl
+++ b/project-5-computer-architecture/hdl/CPU.hdl
@@ -71,7 +71,12 @@ CHIP CPU {
     And(a=isCInstruction, b=d1, out=loadAFromALU);
     Mux16(a=instruction, b=aluOut, sel=loadAFromALU,out=aRegIn);
     Or(a=isAInstruction, b=loadAFromALU, out=loadA);
-    Register(in=aRegIn, load=loadA, out=aRegOut);
+    Register(in=aRegIn, 
+            load=loadA, 
+            // Out
+            out=aRegOut, 
+            out[0..14]=addressM
+    );
 
     // D Register
     And(a=isCInstruction, b=d2, out=loadD);
@@ -84,12 +89,44 @@ CHIP CPU {
     ALU(x=dRegOut,
         y=aluYin,
         zx=c1, nx=c2, zy=c3, ny=c4 , f=c5 , no=c6 , 
-        out=aluOut , 
-        zr=aluZrOut , 
-        ng=aluNgOut 
+        zr=aluZrOut, 
+        ng=aluNgOut,
+        // Out
+        out=aluOut, 
+        out=outM
     );
-    
+
+    // IN in[16], reset, load, inc;
+    // OUT out[16];
+    // inc almost all the time. 
+    // only when not load. load = jump
+
+    // JGT
+    // not negative and not zero
+    Not(in=aluNgOut, out=notAluNgOut);
+    Not(in=aluZrOut, out=notAluZrOut);
+    And(a=notAluZrOut, b=notAluNgOut , out=isPositive);
+    And(a=isPositive, b=j3, out=shouldJumpJGT);
+    // JEQ
+    // Jump if zero can be checked it zr
+    And(a=aluZrOut, b=j2 , out=shouldJumpJEQ);
+    // JLT
+    // Jump if less than 0
+    And(a=aluNgOut, b=j1, out=shouldJumpJLT);
+
+    // Should Jump
+    Or(a=shouldJumpJGT, b=shouldJumpJEQ , out=shouldJumpJGTJEQ);
+    Or(a=shouldJumpJGTJEQ , b= shouldJumpJLT, out=hasJumpInstruction );
+
+    // And C instruction
+    And(a=hasJumpInstruction, b=isCInstruction , out=shouldJump);
+
+    //Inc
+    Not(in=shouldJump, out=shouldIncrement);
 
 
+    PC(in=aRegOut, load=shouldJump, inc=shouldIncrement, reset=reset , out[0..14]=pc);
 
+    // Out
+    And(a=isCInstruction, b=d3 , out=writeM);
 }
diff --git a/project-5-computer-architecture/hdl/Computer.hdl b/project-5-computer-architecture/hdl/Computer.hdl
new file mode 100644
index 0000000..22b7a20
--- /dev/null
+++ b/project-5-computer-architecture/hdl/Computer.hdl
@@ -0,0 +1,44 @@
+// 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/5/Computer.hdl
+/**
+ * The Hack computer, consisting of CPU, ROM and RAM.
+ * When reset = 0, the program stored in the ROM executes.
+ * When reset = 1, the program's execution restarts. 
+ * Thus, to start running the currently loaded program,
+ * set reset to 1, and then set it to 0. 
+ * From this point onwards, the user is at the mercy of the software.
+ * Depending on the program's code, and whether the code is correct,
+ * the screen may show some output, the user may be expected to enter
+ * some input using the keyboard, or the program may do some procerssing. 
+ */
+CHIP Computer {
+
+    IN reset;
+
+    PARTS:
+
+    ROM32K(
+        address=pcOut,
+        out=romInstructionOut
+     );
+
+    CPU(
+        inM=memoryOut, 
+        instruction=romInstructionOut, 
+        reset=reset, 
+        outM=cpuOutMOut, 
+        writeM= cpuWriteMOut, 
+        addressM= cpuAddressMOut,
+        pc=pcOut
+    );
+
+    Memory(
+        in= cpuOutMOut, 
+        load= cpuWriteMOut, 
+        address= cpuAddressMOut, 
+        out=memoryOut 
+    );
+
+}
\ No newline at end of file