From 4c7e2ff085423ce3f36914fe76ce233a49db9d7e Mon Sep 17 00:00:00 2001
From: Riley King-Saunders <riley.kingsaunders@gmail.com>
Date: Fri, 16 Oct 2026 11:29:04 +1100
Subject: [PATCH] Fixed instruction width issue in ROM. Stripped all comments
 to form minimal HEX file to rule out possible parser issues.

---
 asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex | 18 ++++++++++++++++++
 modules/rom.sv                          | 10 +++++-----
 2 files changed, 23 insertions(+), 5 deletions(-)
 create mode 100644 asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex

diff --git a/asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex b/asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex
new file mode 100644
index 0000000..25006fa
--- /dev/null
+++ b/asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex
@@ -0,0 +1,18 @@
+01084023
+25090007
+ad090000
+8d0a0000
+012a5821
+012b6022
+212d0003
+018d7020
+012d8024
+012d8825
+012d9026
+012d9827
+018ea02a
+018ea82b
+25080001
+010db02b
+12d4fffd
+12d6ffff
\ No newline at end of file
diff --git a/modules/rom.sv b/modules/rom.sv
index e18e3c7..9f9a666 100644
--- a/modules/rom.sv
+++ b/modules/rom.sv
@@ -3,19 +3,19 @@
 
 module rom #(parameter m=7,p=4) (
         input logic [m-1:0] Ad,
-        output logic [p-1:0] Dout
+        output logic [2**p-1:0] Dout
     );
     
-    logic [p-1:0] mem[2**m-1:0];
-    assign Dout = mem[Ad];
+    logic [2**p-1:0] mem[2**m];
+    assign Dout = mem[Ad>>2];   // Because word-size versus byte size hack
 
     //Load the program in memory
     // The machine code stored in text file program.dat written in Hex format
     initial begin
         `ifdef QUARTUS_SYNTH
-            $readmemh("../../asm/bin/ELEC4720-2026s2-Ass-02-Demo.txt",mem); //$readmemb for binary
+            $readmemh("../../asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex", mem, 0, 2**m-1); //$readmemb for binary
         `else
-            $readmemh("./asm/bin/ELEC4720-2026s2-Ass-02-Demo.txt",mem); //$readmemb for binary
+            $readmemh("./asm/bin/ELEC4720-2026s2-Ass-02-Demo.hex", mem, 0, 2**m-1); //$readmemb for binary
         `endif
     end
 endmodule // end rom module