diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
index a29e1c2fdb..1b252c29f8 100644
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -20,8 +20,8 @@
                 "F3DEX_GBI_2",
                 "_LANGUAGE_C",
                 "_MIPS_SZLONG=32",
-                "VERSION=pal",
-                "VERSION_PAL"
+                "VERSION=jp",
+                "VERSION_JP"
             ],
             "cStandard": "c89",
             "cppStandard": "c++17",
diff --git a/first_diff.py b/first_diff.py
index e2c7728969..f8a84b4622 100755
--- a/first_diff.py
+++ b/first_diff.py
@@ -1,255 +1,73 @@
 #!/usr/bin/env python3
 
-import os.path
 import argparse
-from subprocess import check_call
+import mapfile_parser
+from pathlib import Path
+import rabbitizer
 
-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(
-    "-d",
-    "--diff",
-    dest="diff_args",
-    nargs="?",
-    action="store",
-    default=False,
-    const="prompt",
-    help="run diff.py on the result with the provided arguments",
-)
-parser.add_argument(
-    "-m", "--make", help="run ninja before finding difference(s)", action="store_true"
-)
-args = parser.parse_args()
-
-diff_count = args.count
-
-if args.make:
-    check_call(["ninja", "ver/current/build/papermario.z64"])
-
-baseimg = f"ver/current/baserom.z64"
-basemap = f"ver/current/expected/build/papermario.map"
-
-myimg = f"ver/current/build/papermario.z64"
-mymap = f"ver/current/build/papermario.map"
-
-if not os.path.isfile(baseimg):
-    print(f"{baseimg} must exist.")
-    exit(1)
-if not os.path.isfile(myimg) or not os.path.isfile(mymap):
-    print(f"{myimg} and {mymap} must exist.")
-    exit(1)
-
-mybin = open(myimg, "rb").read()
-basebin = open(baseimg, "rb").read()
-
-if len(mybin) != len(basebin):
-    print("Modified ROM has different size...")
-    exit(1)
-
-if mybin == basebin:
-    print("No differences!")
-    exit(0)
+script_dir = Path(__file__).resolve().parent
+root_dir = script_dir
+build_dir = root_dir / "ver" / "jp" / "build"
+expected_build_dir = root_dir / "ver/jp/expected/ver/jp/build"
 
 
-def search_rom_address(target_addr):
-    ram_offset = None
-    prev_ram = 0
-    prev_rom = 0
-    prev_sym = "<start of rom>"
-    cur_file = "<no file>"
-    prev_file = cur_file
-    prev_line = ""
-    with open(mymap) as f:
-        for line in f:
-            if "load address" in line:
-                # Ignore .bss sections since we're looking for a ROM address
-                if ".bss" in line or ".bss" in prev_line:
-                    ram_offset = None
-                    continue
-                ram = int(line[16 : 16 + 18], 0)
-                rom = int(line[59 : 59 + 18], 0)
-                ram_offset = ram - rom
-                continue
-
-            prev_line = line
-
-            if (
-                ram_offset is None
-                or "=" in line
-                or "*fill*" in line
-                or " 0x" not in line
-            ):
-                continue
-
-            ram = int(line[16 : 16 + 18], 0)
-            rom = ram - ram_offset
-            sym = line.split()[-1]
-
-            if "0x" in sym:
-                ram_offset = None
-                continue
-            if "/" in sym:
-                cur_file = sym
-                continue
-
-            if rom > target_addr:
-                return (
-                    f"{prev_sym} (RAM 0x{prev_ram:X}, ROM 0x{prev_rom:X}, {prev_file})"
-                )
-
-            prev_ram = ram
-            prev_rom = rom
-            prev_sym = sym
-            prev_file = cur_file
-
-    return "at end of rom?"
-
-
-def parse_map(map_fname):
-    ram_offset = None
-    cur_file = "<no file>"
-    syms = {}
-    prev_sym = None
-    prev_line = ""
-    with open(map_fname) as f:
-        for line in f:
-            if "load address" in line:
-                ram = int(line[16 : 16 + 18], 0)
-                rom = int(line[59 : 59 + 18], 0)
-                ram_offset = ram - rom
-                continue
-
-            prev_line = line
-
-            if (
-                ram_offset is None
-                or "=" in line
-                or "*fill*" in line
-                or " 0x" not in line
-            ):
-                continue
-
-            ram = int(line[16 : 16 + 18], 0)
-            rom = ram - ram_offset
-            sym = line.split()[-1]
-
-            if "0x" in sym:
-                ram_offset = None
-                continue
-            elif "/" in sym:
-                cur_file = sym
-                continue
-
-            syms[sym] = (rom, cur_file, prev_sym, ram)
-            prev_sym = sym
-
-    return syms
-
-
-def map_diff():
-    map1 = parse_map(mymap)
-    map2 = parse_map(basemap)
-    min_ram = None
-    found = None
-    for sym, addr in map1.items():
-        if sym not in map2:
-            continue
-        if addr[0] != map2[sym][0]:
-            if min_ram is None or addr[0] < min_ram:
-                min_ram = addr[0]
-                found = (sym, addr[1], addr[2])
-    if min_ram is None:
-        return False
-    else:
-        print(
-            f"Map appears to have shifted just before {found[0]} ({found[1]}) -- in {found[2]}?"
-        )
-        if found[2] is not None and found[2] not in map2:
-            print(
-                f"(Base map file {basemap} out of date due to new or renamed symbols, so result may be imprecise.)"
-            )
-        return True
-
-
-def hexbytes(bs):
-    return ":".join("{:02X}".format(c) for c in bs)
-
-
-found_instr_diff = []
-map_search_diff = []
-diffs = 0
-shift_cap = 1000
-for i in range(24, len(mybin), 4):
-    # (mybin[i:i+4] != basebin[i:i+4], but that's slightly slower in CPython...)
-    if diffs <= shift_cap and (
-        mybin[i] != basebin[i]
-        or mybin[i + 1] != basebin[i + 1]
-        or mybin[i + 2] != basebin[i + 2]
-        or mybin[i + 3] != basebin[i + 3]
-    ):
-        if diffs == 0:
-            print(f"First difference at ROM addr 0x{i:X}, {search_rom_address(i)}")
-            print(
-                f"Bytes: {hexbytes(mybin[i : i + 4])} vs {hexbytes(basebin[i : i + 4])}"
-            )
-        diffs += 1
-    if (
-        len(found_instr_diff) < diff_count
-        and mybin[i] >> 2 != basebin[i] >> 2
-        and not search_rom_address(i) in map_search_diff
-    ):
-        found_instr_diff.append(i)
-        map_search_diff.append(search_rom_address(i))
-
-if diffs == 0:
-    print("No differences but ROMs differ?")
-    exit()
-
-if len(found_instr_diff) > 0:
-    for i in found_instr_diff:
-        print(f"Instruction difference at ROM addr 0x{i:X}, {search_rom_address(i)}")
-        print(f"Bytes: {hexbytes(mybin[i : i + 4])} vs {hexbytes(basebin[i : i + 4])}")
-print()
-
-definite_shift = diffs > shift_cap
-if definite_shift:
-    print(f"Over {shift_cap} differing words, must be a shifted ROM.")
-else:
-    print(f"{diffs} differing word(s).")
-
-if diffs > 100:
-    if not os.path.isfile(basemap):
-        print(
-            f"To find ROM shifts, copy a clean .map file to {basemap} and rerun this script."
-        )
-    elif not map_diff():
-        print(f"No ROM shift{' (!?)' if definite_shift else ''}")
-
-if args.diff_args:
-    if len(found_instr_diff) < 1:
-        print(f"No instruction difference to run diff.py on")
-        exit()
-
-    diff_sym = search_rom_address(found_instr_diff[0]).split()[0]
-    if args.diff_args == "prompt":
-        diff_args = input("Call diff.py with which arguments? ") or "--"
-    else:
-        diff_args = args.diff_args
-    if diff_args[0] != "-":
-        diff_args = "-" + diff_args
-    check_call(
-        [
-            "python3",
-            "diff.py",
-            diff_args,
-            diff_sym,
-        ]
+def decode_instruction(bytes_diff: bytes, map_file: mapfile_parser.MapFile) -> str:
+    word = (
+        (bytes_diff[0] << 24)
+        | (bytes_diff[1] << 16)
+        | (bytes_diff[2] << 8)
+        | (bytes_diff[3] << 0)
     )
+    instr = rabbitizer.Instruction(word)
+    imm_override = None
+
+    if instr.isJumpWithAddress():
+        # Instruction is a function call (jal)
+
+        # Get the embedded address of the function call
+        sym_address = instr.getInstrIndexAsVram()
+
+        # Search for the address in the mapfile
+        sym_info = map_file.findSymbolByVramOrVrom(sym_address)
+        if sym_info is not None:
+            # Use the symbol from the mapfile instead of a raw value
+            imm_override = sym_info.symbol.name
+
+    return instr.disassemble(immOverride=imm_override, extraLJust=-20)
+
+
+def main():
+    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()
+
+    mapfile_parser.frontends.first_diff.doFirstDiff(
+        build_dir / f"papermario.map",
+        expected_build_dir / f"papermario.map",
+        build_dir / f"papermario.z64",
+        expected_build_dir / f"papermario.z64",
+        args.count,
+        mismatchSize=True,
+        addColons=args.add_colons,
+        bytesConverterCallback=decode_instruction,
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/filemenu/filemenu_createfile.c b/src/filemenu/filemenu_createfile.c
index 6f52f10f15..336f233c4a 100644
--- a/src/filemenu/filemenu_createfile.c
+++ b/src/filemenu/filemenu_createfile.c
@@ -340,6 +340,16 @@ void filemenu_draw_contents_choose_name(
                                      baseX + 2 + menu->col * 19,
                                      baseY + 13 + menu->row * FILEMENU_ROW_AMT);
     }
+
+#if VERSION_JP // TODO ASDF
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+#endif
 }
 
 void filemenu_choose_name_init(MenuPanel* menu) {
@@ -560,6 +570,7 @@ void filemenu_choose_name_handle_input(MenuPanel* menu) {
         sfx_play_sound(SOUND_MENU_NEXT);
         set_window_update(WIN_FILES_CONFIRM_OPTIONS, (s32) filemenu_update_show_name_confirm);
 
+#if !VERSION_JP // TODO ASDF
         gWindows[WIN_FILES_CONFIRM_OPTIONS].pos.y = 121;
         gWindows[WIN_FILES_CONFIRM_OPTIONS].width = 69;
         gWindows[WIN_FILES_CONFIRM_OPTIONS].height = 44;
@@ -580,6 +591,16 @@ void filemenu_choose_name_handle_input(MenuPanel* menu) {
         confirmMenu = filemenu_menus[filemenu_currentMenu];
         confirmMenu->state = FM_CONFIRM_CREATE;
         filemenu_set_selected(confirmMenu, 0, 0);
+#else
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+__asm__("nop");
+#endif
     }
 }
 
diff --git a/src/filemenu/filemenu_info.c b/src/filemenu/filemenu_info.c
index 352538474a..1e547a166e 100644
--- a/src/filemenu/filemenu_info.c
+++ b/src/filemenu/filemenu_info.c
@@ -103,7 +103,9 @@ void filemenu_info_draw_message_contents(
     switch (menu->state) {
         case FM_MESSAGE_DELETED:
             filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_FILE_26), baseX + 10, baseY + 4, 255, 0, 0);
+#if !VERSION_JP // TODO ASDF
             draw_number(filemenu_menus[FILE_MENU_MAIN]->selected + 1, baseX + 48, baseY + 6 + NUMBER_OFFSET_Y, DRAW_NUMBER_CHARSET_NORMAL, MSG_PAL_WHITE, 255, DRAW_NUMBER_STYLE_MONOSPACE | DRAW_NUMBER_STYLE_ALIGN_RIGHT);
+#endif
             filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_HAS_BEEN_DELETED), baseX + 49, baseY + 4, 255, 0, 0);
             break;
         case FM_MESSAGE_COPIED:
@@ -136,6 +138,18 @@ void filemenu_info_draw_message_contents(
     }
 #endif
     filemenu_set_cursor_alpha(0);
+
+#if VERSION_JP // TODO ASDF
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+
+#endif
 }
 
 void filemenu_info_init(MenuPanel* tab) {
diff --git a/src/filemenu/filemenu_main.c b/src/filemenu/filemenu_main.c
index 1d6e7511ac..9949e2b281 100644
--- a/src/filemenu/filemenu_main.c
+++ b/src/filemenu/filemenu_main.c
@@ -659,6 +659,9 @@ void filemenu_draw_contents_file_title(
         }
 }
 #else
+// #if VERSION_JP
+// INCLUDE_ASM(s32, "filemenu/filemenu_main", filemenu_draw_contents_file_title);
+// #else
 void filemenu_draw_contents_file_title(
     s32 fileIdx,
     MenuPanel* menu,
@@ -672,6 +675,13 @@ void filemenu_draw_contents_file_title(
 
     filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_FILE_26), baseX + FILE_X, baseY + 1, 255, 0, 1);
 
+#if VERSION_JP // TODO ASDF
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+#endif
     if (!gSaveSlotHasData[fileIdx]) {
         draw_number(fileIdx + 1, baseX + FILE_NUMBER_X, baseY + 1 + NUMBER_OFFSET_Y, DRAW_NUMBER_CHARSET_THIN, MSG_PAL_WHITE, 255, DRAW_NUMBER_STYLE_MONOSPACE);
     } else {
@@ -683,6 +693,7 @@ void filemenu_draw_contents_file_title(
     }
 }
 #endif
+//#endif
 
 void filemenu_draw_contents_file_0_info(
     MenuPanel* menu,
diff --git a/src/filemenu/filemenu_msg.c b/src/filemenu/filemenu_msg.c
index 408faedfeb..318350ca01 100644
--- a/src/filemenu/filemenu_msg.c
+++ b/src/filemenu/filemenu_msg.c
@@ -686,6 +686,13 @@ s32 filemenu_draw_char(s32 c, s32 x, s32 y, s32 flag1, s32 color, s32 flag2) {
     }
 #endif
 
+#if VERSION_JP // TODO ASDF
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+    __asm__("nop");
+#endif
+
     if (c == MSG_CHAR_READ_SPACE) {
         return charWidth - 6;
     }
diff --git a/src/filemenu/filemenu_yesno.c b/src/filemenu/filemenu_yesno.c
index f9308c6a7b..e50497c184 100644
--- a/src/filemenu/filemenu_yesno.c
+++ b/src/filemenu/filemenu_yesno.c
@@ -120,6 +120,7 @@ MenuPanel filemenu_yesno_menuBP = {
     .fpCleanup = &filemenu_yesno_cleanup
 };
 
+
 void filemenu_yesno_draw_options_contents(
     MenuPanel* menu,
     s32 baseX, s32 baseY,
@@ -199,7 +200,9 @@ void filemenu_yesno_draw_prompt_contents(
             xOffset = DELETE_FILE_FILE_X;
             filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_FILE_22), baseX + xOffset, baseY + 4, 0xFF, 0, 0);
             xOffset += DELETE_FILE_NUMBER_X;
+#if !VERSION_JP // TODO ASDF
             draw_number(filemenu_menus[FILE_MENU_MAIN]->selected + 1, baseX + xOffset, baseY + 6 + NUMBER_OFFSET_Y, DRAW_NUMBER_CHARSET_NORMAL, MSG_PAL_WHITE, 0xFF, DRAW_NUMBER_STYLE_MONOSPACE | DRAW_NUMBER_STYLE_ALIGN_RIGHT);
+#endif
             xOffset += DELETE_FILE_QMARK_X;
             filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_QUESTION), baseX + xOffset, baseY + 4, 0xFF, 0, 0);
             break;
@@ -248,7 +251,9 @@ void filemenu_yesno_draw_prompt_contents(
             }
 #endif
             xOffset += START_GAME_FILE_X;
+#if !VERSION_JP // TODO ASDF
             filemenu_draw_message(filemenu_get_menu_message(FILE_MESSAGE_FILE_22), baseX + xOffset, baseY + 4, 0xFF, 0, 0);
+#endif
             xOffset += START_GAME_NUMBER_X;
             draw_number(filemenu_menus[FILE_MENU_MAIN]->selected + 1, baseX + xOffset, baseY + 6 + NUMBER_OFFSET_Y, DRAW_NUMBER_CHARSET_NORMAL, MSG_PAL_WHITE, 0xFF, DRAW_NUMBER_STYLE_MONOSPACE | DRAW_NUMBER_STYLE_ALIGN_RIGHT);
             xOffset += START_GAME_QMARK_X;
@@ -259,6 +264,11 @@ void filemenu_yesno_draw_prompt_contents(
 #endif
             break;
     }
+
+#if VERSION_JP // TODO ASDF
+__asm__("nop");
+__asm__("nop");
+#endif
 }
 
 void filemenu_yesno_init(MenuPanel* tab) {
diff --git a/ver/jp/splat.yaml b/ver/jp/splat.yaml
index 8416d5b57e..cd5629490c 100644
--- a/ver/jp/splat.yaml
+++ b/ver/jp/splat.yaml
@@ -28,6 +28,7 @@ options:
   symbol_name_format: JP_$VRAM
   symbol_name_format_no_rom: JP_$VRAM_$SEG
   hasm_in_src_path: True
+  use_legacy_include_asm: True
 asset_stack:
   - jp
 segments:
@@ -1222,7 +1223,28 @@ segments:
       - [0x16A010, .data,      pause_gfx]
     - [0x16B3F0]
 
-  - [0x16B550, bin]
+  - type: code
+    dir: filemenu
+    start: 0x16B550
+    vram: 0x80242370
+    subsegments:
+    - [0x16B550, c, filemenu_common]
+    - [0x16D5E0, c, filemenu_main]
+    - [0x16F6C0, c, filemenu_yesno]
+    - [auto, c, filemenu_info]
+    - [auto, c, filemenu_createfile]
+    - [auto, c, filemenu_gfx]
+    - [auto, c, filemenu_msg]
+    - [auto, c, filemenu_styles]
+    - start: 0x172000
+      type: .data
+      name: filemenu_gfx
+      subsegments:
+      - [auto, ia4, copyarrow, 64, 16]
+      - [auto, rgba32, corners_yellow, 16, 64]
+      - [auto, ia8, corners_gray, 16, 32]
+      - [auto, .data, filemenu_gfx] ## ?????? this looks kinda borken
+  - [0x1749F0]
 
   - name: battle_code
     type: code
@@ -14743,9 +14765,8 @@ segments:
 
   - [0xF19D60, bin]
 
-  - start: 0xFC0000
-    type: pm_sbn
-    name: audio
+  - [0xFC0000, pm_sbn, audio]
+
   - [ 0x1A01AF0, bin ]
 
   - start: 0x1A40000
diff --git a/ver/jp/symbol_addrs.txt b/ver/jp/symbol_addrs.txt
index 19bf6600fd..236faa2719 100644
--- a/ver/jp/symbol_addrs.txt
+++ b/ver/jp/symbol_addrs.txt
@@ -5300,3 +5300,6 @@ D_0A000000_E91890 = 0x0A000000; // rom:0xE9A710
 charset_peach_letter_png = 0x0000FC10; //rom:0x11EF40
 charset_postcard_png = 0x00013B98; //rom:0x122EC8
 charset_letter_content_1_png = 0x00015A80; //rom:0x124DB0
+
+// the below might be wrong cause it's not disassembling
+filemenu_draw_contents_file_title = 0x80242370; // type:func rom:0x16DDFC