diff --git a/missings/knowns.txt b/missings/knowns.txt
new file mode 100644
index 0000000..3088501
--- /dev/null
+++ b/missings/knowns.txt
@@ -0,0 +1,296 @@
+3do_arcade_saot.bin
+5200.rom
+64DD_IPL.bin
+7800 BIOS (E).rom
+7800 BIOS (U).rom
+airlbios.zip
+areplay.bin
+ATARIBAS.ROM
+ATARIOSA.ROM
+ATARIOSB.ROM
+ATARIXL.ROM
+awbios.zip
+bios7.bin
+bios9.bin
+bios_CD_E.bin
+bios_CD_J.bin
+bios_CD_U.bin
+BIOS.col
+bios_E.sms
+bios.gg
+bios_J.sms
+bios_MD.bin
+bios.min
+bios.sms
+bios_U.sms
+BS-X.bin
+BS-X.bin.sfc (japan, oficial)
+c52.bin
+CD32 Extended-ROM r40.60 (1993)(Commodore)(CD32).rom
+CDTV Extended-ROM v1.0 (1991)(Commodore)(CDTV)[!].rom
+citra
+citra/nand
+citra/nand/00000000000000000000000000000000
+citra/nand/00000000000000000000000000000000/title
+citra/nand/00000000000000000000000000000000/title/0004009b
+citra/nand/00000000000000000000000000000000/title/0004009b/00010202
+citra/nand/00000000000000000000000000000000/title/0004009b/00010202/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00010202/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/0004009b/00010402
+citra/nand/00000000000000000000000000000000/title/0004009b/00010402/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00010402/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/0004009b/00014002
+citra/nand/00000000000000000000000000000000/title/0004009b/00014002/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00014002/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/0004009b/00014102
+citra/nand/00000000000000000000000000000000/title/0004009b/00014102/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00014102/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/0004009b/00014202
+citra/nand/00000000000000000000000000000000/title/0004009b/00014202/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00014202/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/0004009b/00014302
+citra/nand/00000000000000000000000000000000/title/0004009b/00014302/content
+citra/nand/00000000000000000000000000000000/title/0004009b/00014302/content/00000000.app.romfs
+citra/nand/00000000000000000000000000000000/title/000400db
+citra/nand/00000000000000000000000000000000/title/000400db/00010302
+citra/nand/00000000000000000000000000000000/title/000400db/00010302/content
+citra/nand/00000000000000000000000000000000/title/000400db/00010302/content/00000000.app.romfs
+citra/sysdata
+citra/sysdata/shared_font.bin
+Complex_4627.bin
+cx4.data.rom
+CYRILLIC.FNT
+dc
+dc/airlbios.zip
+dc/awbios.zip
+dc/boot.bin
+dc_boot.bin
+dc/dc_boot.bin
+dc/dc_flash.bin
+dc/f355bios.zip
+dc/f355dlx.zip
+dc/flash.bin
+dc_flash.bin
+dc/hod2bios.zip
+dc/naomi2.zip
+dc/naomigd.zip
+dc/naomi.zip
+dc_nvmem.bin
+DISK.ROM
+disksys.rom
+dolphin-emu
+dolphin-emu/Sys
+dolphin-emu/Sys/GC
+dolphin-emu/Sys/GC/EUR
+dolphin-emu/Sys/GC/EUR/IPL.bin
+dolphin-emu/Sys/GC/JAP
+dolphin-emu/Sys/GC/JAP/IPL.bin
+dolphin-emu/Sys/GC/USA
+dolphin-emu/Sys/GC/USA/IPL.bin
+dsp1b.data.rom
+dsp1b.program.rom
+dsp1.data.rom
+dsp1.program.rom
+dsp2.data.rom
+dsp2.program.rom
+dsp3.data.rom
+dsp3.program.rom
+dsp4.data.rom
+dsp4.program.rom
+ECS.bin
+epochtv.chr
+EROM.BIN
+exec.bin
+f355bios.zip
+f355dlx.zip
+firmware.bin
+FMPAC16.ROM
+FMPAC.ROM
+g7400.bin
+gba_bios.bin
+gb_bios.bin
+gbc_bios.bin
+gexpress.pce
+ggenie.bin
+goldstar.bin
+grom.bin
+hod2bios.zip
+ITALIC.FNT
+IVOICE.bin
+jopac.bin
+KANJI.ROM
+keropi
+keropi/cgrom.dat
+keropi/iplrom30.dat
+keropi/iplromco.dat
+keropi/iplrom.dat
+keropi/iplromxv.dat
+kick34005.A500
+kick34005.CDTV
+kick37175.A500
+kick40060.CD32
+kick40060.CD32.ext
+kick40063.A600
+kick40068.A1200
+kick40068.A4000
+Kickstart v1.2 r33.180 (1986)(Commodore)(A500-A1000-A2000)[!].rom
+Kickstart v1.2 rev 33.166 (1986)(Commodore)(A1000).rom
+Kickstart v1.3 r34.5 (1987)(Commodore)(A500-A1000-A2000-CDTV)[o].rom
+Kickstart v1.3 r34.5 (1987)(Commodore)(A500-A1000-A2000-CDTV)[!].rom
+Kickstart v2.04 r37.175 (1991)(Commodore)(A500+)[!].rom
+Kickstart v2.05 r37.350 (1992)(Commodore)(A600HD)[!].rom
+Kickstart v3.1 r40.60 (1993)(Commodore)(CD32).rom
+Kickstart v3.1 r40.68 (1993)(Commodore)(A1200)[!].rom
+Kickstart v3.1 r40.68 (1993)(Commodore)(A3000).rom
+Kickstart v3.1 r40.68 (1993)(Commodore)(A4000).rom
+kronos
+kronos/mpr-18811-mx.ic1
+kronos/mpr-19367-mx.ic1
+kronos/saturn_bios.bin
+kronos/stvbios.zip
+LICENSE
+lynxboot.img
+mcpx_1.0.bin
+mpr-17933.bin
+mpr-18811-mx.ic1
+mpr-19367-mx.ic1
+MSX2EXT.ROM
+MSX2PEXT.ROM
+MSX2P.ROM
+MSX2.ROM
+MSXDOS2.ROM
+MSX.ROM
+Mupen64plus
+Mupen64plus/cache
+Mupen64plus/cache/readme.txt
+Mupen64plus/IPL.n64
+naomi2.zip
+naomi.bin
+naomigd.zip
+naomi.zip
+neocd
+neocd/000-lo.lo
+neocd-cdz.bin
+neocd-front-load.bin
+neocd/front-sp1.bin
+neocd/neocd.bin
+neocd/neocd_f.rom
+neocd/neocd_sf.rom
+neocd/neocd_st.rom
+neocd/neocd_sz.rom
+neocd/neocd_t.rom
+neocd/neocd_z.rom
+neocd/ng-lo.rom
+neocd-top-load.bin
+neocd/top-sp1.bin
+neocd-unibios-3.3.bin
+neocd-unibios.bin
+neocd/uni-bioscd.rom
+neocd_z.rom
+neocdz.zip
+neogeo.zip
+nes.pal
+ng-lo.rom
+np2kai
+np2kai/2608_bd.wav
+np2kai/2608_hh.wav
+np2kai/2608_rim.wav
+np2kai/2608_sd.wav
+np2kai/2608_tom.wav
+np2kai/2608_top.wav
+np2kai/bios.rom
+np2kai/font.bmp
+np2kai/FONT.ROM
+np2kai/itf.rom
+np2kai/memory.bin
+np2kai/sound.rom
+o2rom.bin
+PAINTER.ROM
+palmos41-en-m515.rom
+panafz10.bin
+panafz10e-anvil.bin
+panafz10e-anvil-norsa.bin
+panafz10e-anvil-patched.bin
+panafz10ja-anvil-kanji
+panafz10ja-anvil-kanji.bin
+panafz10-norsa.bin
+panafz10-patched.bin
+panafz1.bin
+panafz1j.bin
+panafz1j-kanji.bin
+panafz1j-norsa.bin
+panafz1-kanji.bin
+pcfx.rom
+pcsx2
+pcsx2/bios
+pcsx2/bios/EROM.BIN
+pcsx2/bios/rom1.bin
+ProSystem.dat
+quasi88
+quasi88/DISK.ROM
+quasi88/font.rom
+quasi88/N88_0.ROM
+quasi88/N88_1.ROM
+quasi88/N88_2.ROM
+quasi88/N88_3.ROM
+quasi88/n88jisho.rom
+quasi88/N88KNJ1.ROM
+quasi88/N88KNJ2.ROM
+quasi88/N88N.ROM
+quasi88/N88.ROM
+rom1.bin
+ROM2.BIN
+rom.db
+RS232.ROM
+sanyotry.bin
+saturn_bios.bin
+scph10000.bin
+scph1000.bin
+scph1001.bin
+scph101.bin
+SCPH30004R.bin
+SCPH30004R.MEC
+SCPH30004R.NVM
+scph39001.bin
+scph39001.MEC
+scph39001.NVM
+scph5500.bin
+scph5501.bin
+scph5502.bin
+scph7001.bin
+scph7003.bin
+sega_101.bin
+sega_101_jp_us_eu_hack.bin
+SGB1.sfc
+SGB2.sfc
+sgb_bios.bin
+sk2chip.bin
+sk.bin
+sl31253.bin
+sl31254.bin
+sl90025.bin
+st010.data.rom
+st010.program.rom
+st011.data.rom
+st011.program.rom
+st018.data.rom
+st018.program.rom
+STBIOS.bin
+stvbios.zip
+switch
+switch/keys
+switch/keys/prod.keys
+switch/keys/title.keys
+syscard1.pce
+syscard2.pce
+syscard2u.pce
+syscard3.pce
+syscard3u.pce
+tos.img
+uae_data
+uae_data/drive_click_LOUD.wav
+uae_data/drive_snatch_LOUD.wav
+uae_data/drive_spin_LOUD.wav
+uae_data/drive_spinnd_LOUD.wav
+uae_data/drive_startup_LOUD.wav
+upd7801g.s01
diff --git a/missings/retrodeck.py b/missings/retrodeck.py
new file mode 100755
index 0000000..430024f
--- /dev/null
+++ b/missings/retrodeck.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+
+from argparse import ArgumentParser
+from csv import reader
+from hashlib import md5
+from pathlib import Path
+from urllib import request
+
+parser = ArgumentParser()
+parser.add_argument(
+    "-d",
+    "--directory",
+    default=Path.cwd(),
+    type=Path,
+    help="Folder to scan for existing bioses",
+)
+args = parser.parse_args()
+knowns = []
+
+with open(Path(__file__).parent / "knowns.txt", "r") as f:
+    knowns = f.read().splitlines()
+
+with request.urlopen(
+    "https://raw.githubusercontent.com/RetroDECK/RetroDECK/main/emu-configs/defaults/retrodeck/reference_lists/bios_checklist.cfg"
+) as response:
+    bioses = reader(response.read().decode().splitlines(), delimiter="^")
+
+    for bios in bioses:
+        if "pico" in bios[0]:
+            continue
+
+        bios_path = args.directory / bios[1] / bios[0]
+
+        if not bios_path.is_file():
+            print(
+                f"\033[91mMissing {bios_path.relative_to(args.directory)} on {bios[3]} with hash {bios[2]}\033[00m"
+            )
+        elif bios[2] == "Unknown":
+            if str(bios_path.relative_to(args.directory)) not in knowns:
+                print(
+                    f"Unknown checksum for {bios_path.relative_to(args.directory)} on {bios[3]}"
+                )
+        else:
+            with open(bios_path, "rb") as file:
+                checksum = md5(file.read()).hexdigest()
+
+                if checksum != bios[2] and bios[1] != "dc/":
+                    print(
+                        f"\033[93mChecksum mismatch for {bios_path.relative_to(args.directory)} on {bios[3]}: {checksum}\033[00m != \033[92m{bios[2]}\033[00m"
+                    )