emulator: Hatari
type: libretro
core_classification: official_port
source: "https://github.com/libretro/hatari"
upstream: "https://github.com/hatari/hatari"
logo: "https://raw.githubusercontent.com/hatari/hatari/main/share/icons/hicolor/scalable/apps/hatari.svg"
profiled_date: "2026-09-03"
source_commit: "7fd34ccf34c6ea12b7f2b960b2f167d7f251892d"
upstream_commit: "51ed9991101fdc4623b3b38ec16e5a170cf2dffa"
core_version: "2.6.1-devel"
display_name: "Atari - ST/STE/TT/Falcon (Hatari)"
cores:
  - hatari
systems:
  - atari-st
  - atari-ste
  - atari-tt
  - atari-falcon

notes: |
  The main branch of libretro/hatari is the upstream Hatari tree with its
  experimental libretro target in src/retro, which upstream added in
  January 2026, plus the port commits that follow the merge base recorded
  as upstream_commit: VFS, disk control, core options and hard disk
  loading. It builds as hatari_libretro (.gitlab-ci-libretro.yml:10-11,
  src/CMakeLists.txt:371-402), reports library_name hatari and the
  HATARI_VERSION string 2.6.1-devel (src/retro/main_retro.c:219-220,
  src/includes/version.h:8). The .info shipped in the tree declares no
  firmware (share/libretro/info/libretro-hatari.info); the
  hatari_libretro.info in libretro-core-info still describes the 1.8 port
  and its tos.img MD5, which this code never checks.

  retro_init builds <system>/tos.img, records whether it exists and passes
  it as --tos (src/retro/main_retro.c:157-204); when it is absent a
  frontend message is shown and retro_run only refreshes the framebuffer
  (src/retro/main_retro.c:186-189, src/retro/main_retro.c:251-262). The
  name is fixed by that check: the .rom and .tos fallbacks of File_Read
  (src/tos.c:61-67, src/file.c:298-339, src/file.c:530-569) are never
  reached under a frontend. Without a system directory Main_Init runs
  with no --tos and the TOS path falls back to tos.img in the Hatari data
  directory derived from the executable location (src/configuration.c:810-812,
  src/paths.c:299-331, CMakeLists.txt:418-430). TOS_LoadImage strips the
  256-byte (34-byte for 4.92) loader of a RAM TOS, detects EmuTOS by ETOS
  at offset 0x2c, refuses images below 0x40 bytes, above 1 MB, with a
  version outside 0x100-0x6FF or a load address other than 0xE00000 or
  0xFC0000, and coerces machine type and CPU to the TOS version unless
  the image is a 512 KB or larger EmuTOS (src/tos.c:976-1097,
  src/tos.c:838-969). ROM patches apply when the hatari_patch_tos option
  is on (src/retro/options.c:250-263, src/retro/options.c:783). No TOS is
  embedded. Because nSymbolsAutoLoad defaults to SYM_AUTOLOAD_DEBUGGER
  (src/configuration.c:621, src/includes/configuration.h:29-31), every TOS
  load also reads a <tos>.sym symbol table when one exists
  (src/tos.c:1094, src/debug/symbols.c:1095-1113,
  src/debug/symbols.c:1002-1020, src/debug/symbols.c:372-407).

  The Hatari home directory is the RetroArch save directory
  (src/paths.c:236-250). Configuration is read from <CONFDIR>/hatari.cfg,
  /etc on Unix and the current directory on Windows, then from hatari.cfg
  in that home directory, before the --tos argument is applied
  (src/main.c:256-278, src/main.c:315-318, src/configuration.c:862-867,
  src/configuration.c:1061-1071, CMakeLists.txt:440-457). Every section is
  honoured: the cartridge image (src/configuration.c:487-493), floppy
  images, GEMDOS directories and ACSI, SCSI and IDE images
  (src/configuration.c:362-364, src/configuration.c:375-483), MIDI, printer
  and RS232 host endpoints (src/configuration.c:509-543), all disabled by
  default (src/configuration.c:736-761) and opened by Midi_Host_Open,
  Printer_TransferByteTo and RS232_OpenCOMPort when enabled
  (src/midi.c:342-367, src/printer.c:42-65, src/printer.c:89-106,
  src/rs232.c:175-230). szMappingFileName is parsed
  (src/configuration.c:256) but the port's Keymap_LoadRemapFile is empty
  (src/retro/keymap.c:222-224); only the SDL build reads a keymap file
  (src/sdl/keymap.c:701). The autosave snapshot is restored by
  M68000_Start (src/m68000.c:332-348), which the port never calls. TT and
  Falcon NVRAM is hatari.nvram in the home directory, read at NvRam_Init
  and written at exit (src/falcon/nvram.c:282-294,
  src/falcon/nvram.c:334-337).

  Content is a floppy image, an .m3u list parsed relative to its own
  directory (src/retro/disk_control.c:96-184), an .ide image put on the
  IDE master, a .vhd image put on ACSI 0 or a .gem marker naming a GEMDOS
  directory (src/retro/main_retro.c:370-424, src/retro/harddisk.c:32-129).
  With a .gem, <system>/hatari/BOOT.ST is inserted into drive A when it
  exists (src/retro/harddisk.c:104-127). A disk whose name ends in A pulls
  the sibling ending in B into drive B (src/floppy.c:300-343,
  src/floppy.c:385-388), and an STX image reads its .wd1772 overlay from
  the same directory (src/floppies/stx.c:807-825). Savestates pass through
  hatari_savestate.tmp in the system directory
  (src/retro/main_retro.c:41, src/retro/main_retro.c:293-357). IPF support
  is compiled in from rsn8887/capsimg when ENABLE_STATIC_CAPSIMAGE is on
  (cmake/BuildDependencies.cmake:93-126); the Windows and Vita CI jobs turn
  it off (.gitlab-ci-libretro.yml:97, .gitlab-ci-libretro.yml:105,
  .gitlab-ci-libretro.yml:189).
  File access goes through the libretro VFS when the frontend provides it
  (src/retro/vfs.c:17-49, src/file.c:239-286, src/file.c:465-478).

files:
  - name: "tos.img"
    path: "tos.img"
    description: "Atari TOS ROM image"
    required: true
    max_size: 1048576
    validation: [size]
    source_ref: "src/retro/main_retro.c:157-204, src/retro/main_retro.c:251-262, src/options.c:1937-1945, src/tos.c:61-67, src/tos.c:976-1097, src/tos.c:838-969, src/file.c:298-339"
    note: >
      Any TOS 1.00 to 4.04, TOS 0.00, a RAM TOS or EmuTOS. The file must
      carry this exact name: retro_init only enables emulation when
      <system>/tos.img exists.

  - name: "tos.sym"
    path: "tos.sym"
    description: "Symbol table for the TOS image, nm-style text or a program symbol table"
    required: false
    storage: user_provided
    unsourceable: "matches whichever image is installed as tos.img; EmuTOS releases ship one per ROM, Atari TOS has none"
    source_ref: "src/tos.c:1094, src/debug/symbols.c:1095-1113, src/debug/symbols.c:1002-1020, src/debug/symbols.c:372-407, src/configuration.c:621, src/includes/configuration.h:29-31"
    note: >
      Read next to tos.img at every TOS load when present; the symbols
      serve the built-in debugger.

  - name: "cartridge ROM"
    path: null
    config_key: "szCartridgeImageFileName"
    description: "Atari ST cartridge image loaded at 0xFA0000"
    required: false
    min_size: 40
    max_size: 131076
    validation: [size]
    source_ref: "src/cart.c:39-46, src/cart.c:52-88, src/cart.c:97-105, src/cart.c:115-141, src/configuration.c:487-493, src/configuration.c:814"
    note: >
      Set through hatari.cfg. Raw images up to 0x20000 bytes or .stc
      images of exactly 0x20004 bytes whose 4-byte header is skipped;
      extensions .img, .rom and .stc are tried when the configured path is
      missing. Replaced by the built-in GEMDOS trampoline whenever GEMDOS
      hard disk emulation, extended VDI or OS tracing is on.

  - name: "BOOT.ST"
    path: "hatari/BOOT.ST"
    description: "Boot floppy inserted with GEMDOS hard disk folders"
    required: false
    source_ref: "src/retro/harddisk.c:78-129, src/retro/main_retro.c:393-396"
    note: "Inserted into drive A when the content is a .gem file."

  - name: "hatari.cfg"
    path: null
    description: "Hatari configuration file"
    required: false
    storage: user_provided
    unsourceable: "user settings in Hatari's INI format; no canonical contents"
    source_ref: "src/main.c:256-278, src/main.c:315-318, src/configuration.c:862-867, src/configuration.c:1061-1071, src/paths.c:236-250, CMakeLists.txt:440-457"
    note: >
      Read from <CONFDIR>/hatari.cfg and then from hatari.cfg in the
      RetroArch save directory, before the --tos argument is applied.

  - name: "hatari.nvram"
    path: null
    description: "TT and Falcon NVRAM contents, 50 bytes"
    required: false
    has_builtin: true
    min_size: 50
    validation: [size]
    storage: user_provided
    unsourceable: "machine state the emulator writes itself at exit; no canonical contents"
    source_ref: "src/falcon/nvram.c:96-97, src/falcon/nvram.c:116-141, src/falcon/nvram.c:148-171, src/falcon/nvram.c:282-294, src/falcon/nvram.c:334-337, src/paths.c:236-250, src/main.c:204"
    note: >
      Read from the RetroArch save directory at NvRam_Init; a short read
      keeps the built-in defaults. Saved back on exit.