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

@@ -0,0 +1,18 @@
+01084023
+25090007
+ad090000
+8d0a0000
+012a5821
+012b6022
+212d0003
+018d7020
+012d8024
+012d8825
+012d9026
+012d9827
+018ea02a
+018ea82b
+25080001
+010db02b
+12d4fffd
+12d6ffff

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