diff --git a/Makefile b/Makefile
index 8a1e407..b184c75 100644
--- a/Makefile
+++ b/Makefile
@@ -105,6 +105,11 @@ distclean: clean
 
 setup: clean distclean split
 
+diff-init: all
+	$(RM) -rf expected/
+	mkdir -p expected/
+	cp -r $(BUILD_DIR) expected/$(BUILD_DIR)
+
 split:
 	$(V)$(SPLAT)
 	@touch $(SPLAT_TIMESTAMP)
diff --git a/splat.yaml b/splat.yaml
index 425498a..e2d9c67 100644
--- a/splat.yaml
+++ b/splat.yaml
@@ -5,7 +5,7 @@ options:
   target_path: baserom.z64
   base_path: .
   compiler: GCC
-  find_file_boundaries: True
+  find_file_boundaries: False
   header_encoding: ASCII
   platform: n64
   asm_inc_header: ""
@@ -39,7 +39,7 @@ segments:
     start: 0x1000
     vram: 0x80070C00
     subsegments:
-      - [0x1000, asm, entry]
+      - [0x1000, asm, "entry_code"]
 
   - name: main
     type: code
@@ -60,6 +60,7 @@ segments:
       - [0xFF10, asm]
       - [0x10110, asm]
       - [0x10190, asm]
+      - [0x10190, asm]
       - [0x10250, asm]
       - [0x102E0, asm]
       - [0x10340, asm]
@@ -408,6 +409,7 @@ segments:
       - { start: 0x66E10, type: bss, vram: 0x80190F10 }
       
   - [0x66E10, bin]
+
   # __SOME_OVERLAY_TABLE[0]
   # - type: code
   #   dir: overlay_66E10
@@ -462,24 +464,24 @@ segments:
 
   #     - { start: 0x71280, type: bss, vram: 0x8019A790 }
 
-  # - type: code
-  #   dir: overlay_71280
-  #   start: 0x71280
-  #   vram: 0x8019A7A0
-  #   bss_size: 0x40
-  #   symbol_name_format: overlay_71280_$VRAM_$ROM
-  #   exclusive_ram_id: test_overlapping
-  #   subsegments:
-  #     - [0x71280, asm]
+  - type: code
+    dir: overlay_71280
+    start: 0x71280
+    vram: 0x8019A7A0
+    bss_size: 0x40
+    symbol_name_format: overlay_71280_$VRAM_$ROM
+    exclusive_ram_id: test_overlapping
+    subsegments:
+      - [0x71280, asm]
 
-  #     - [0x783A0, rodata]
-  #     - [0x78410, rodata]
-  #     - [0x785D0, rodata]
-  #     - [0x790F0, rodata]
-  #     - [0x79160, rodata]
-  #     - [0x793F0, rodata]
+      - [0x783A0, rodata, "71280"]
+      - [0x78410, rodata]
+      - [0x785D0, rodata]
+      - [0x790F0, rodata]
+      - [0x79160, rodata]
+      - [0x793F0, rodata]
 
-  #     - { start: 0x79730, type: bss, vram: 0x8019A790 }
+      # - { start: 0x79730, type: bss, vram: 0x801A2C50 }
 
   - type: code
     dir: overlay_79730
diff --git a/symbol_addrs.txt b/symbol_addrs.txt
index 06a173f..317298d 100644
--- a/symbol_addrs.txt
+++ b/symbol_addrs.txt
@@ -9,6 +9,8 @@ __OVERLAY_INFO_71280_65CA0 = 0x8018FDA0;
 __setup_overlay_71280_51940 = 0x8017BA40; // rom:0x51940
 
 __OVERLAY_INFO_71280_65C8C = 0x8018FD8C;
+__get_overlay_info_71280_65C8C = 0x8017B5E0;
+
 __setup_overlay_71280_51674 = 0x8017B774; // rom:0x51674
 
 __OVERLAY_INFO_8018FAE4 = 0x8018FAE4;
diff --git a/tools/first_diff.py b/tools/first_diff.py
new file mode 100644
index 0000000..db7c7cc
--- /dev/null
+++ b/tools/first_diff.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: © 2022 AngheloAlf
+# SPDX-License-Identifier: MIT
+
+from __future__ import annotations
+
+import argparse
+import mapfile_parser
+from pathlib import Path
+import rabbitizer
+
+
+def decodeInstruction(bytesDiff: bytes, mapFile: mapfile_parser.MapFile) -> str:
+    word = (bytesDiff[0] << 24) | (bytesDiff[1] << 16) | (bytesDiff[2] << 8) | (bytesDiff[3] << 0)
+    instr = rabbitizer.Instruction(word)
+    immOverride = None
+
+    if instr.isJumpWithAddress():
+        # Instruction is a function call (jal)
+
+        # Get the embedded address of the function call
+        symAddress = instr.getInstrIndexAsVram()
+
+        # Search for the address in the mapfile
+        symInfo = mapFile.findSymbolByVramOrVrom(symAddress)
+        if symInfo is not None:
+            # Use the symbol from the mapfile instead of a raw value
+            immOverride = symInfo.symbol.name
+
+    return instr.disassemble(immOverride=immOverride, extraLJust=-20)
+
+def firstDiffMain():
+    parser = argparse.ArgumentParser(description="Find the first difference(s) between the built ROM and the base ROM.")
+
+    parser.add_argument("-c", "--count", type=int, default=5, help="find up to this many instruction difference(s)")
+#    parser.add_argument("-v", "--version", help="Which version should be processed", default="us")
+    parser.add_argument("-a", "--add-colons", action='store_true', help="Add colon between bytes" )
+
+    args = parser.parse_args()
+
+    buildFolder = Path("build")
+
+    BUILTROM = buildFolder / f"ogrebattle64.z64"
+    BUILTMAP = buildFolder / f"ogrebattle64.map"
+
+    EXPECTEDROM = "expected" / BUILTROM
+    EXPECTEDMAP = "expected" / BUILTMAP
+
+    mapfile_parser.frontends.first_diff.doFirstDiff(BUILTMAP, EXPECTEDMAP, BUILTROM, EXPECTEDROM, args.count, mismatchSize=True, addColons=args.add_colons, bytesConverterCallback=decodeInstruction)
+
+if __name__ == "__main__":
+    firstDiffMain()
diff --git a/tools/splat b/tools/splat
index c6e925f..e0fb798 160000
--- a/tools/splat
+++ b/tools/splat
@@ -1 +1 @@
-Subproject commit c6e925fc9b610a4b0a76f16773595ccaa67d2ffe
+Subproject commit e0fb79806748ef400c225b6841403078df5b9986