emulator: hatariB
type: libretro
core_classification: community_fork
source: "https://github.com/bbbradsmith/hatariB"
upstream: "https://github.com/hatari/hatari"
profiled_date: "2026-09-17"
source_commit: "4fb7ebdfa14d5de7df3076143f255d7d8bf0323c"
upstream_commit: "6a8e26d69fb32d61efd398dc1ad9a77122400034"
core_version: "1.1 unstable preview"
display_name: "Atari - ST/STE/TT/Falcon (hatariB)"
cores:
  - hatarib
systems:
  - atari-st
  - atari-ste
  - atari-tt
  - atari-falcon

notes: |
  hatariB carries Hatari 2.6.1 in its hatari/ directory, every change
  fenced by __LIBRETRO__ (DEVELOP.md:7-14, DEVELOP.md:44-48), and
  builds as hatarib (makefile.libretro:1, makefile.libretro:3,
  core/core.c:1134). The upstream_commit is the v2.6.1 tag the tree was
  taken from. The core reads and writes through core_file.c, using the
  libretro VFS when the frontend offers version 3
  (core/core_file.c:747-790). Hatari's own
  directory strings are replaced by <nopath> (hatari/src/paths.c:339-350),
  hatari.cfg is never read because Main_LoadInitialConfig calls
  core_config_init instead (hatari/src/main.c:987-1015,
  core/core_config.c:1440-1445), and printer, RS232 and keymap file
  settings keep their disabled defaults with no option to change them
  (hatari/src/configuration.c:728, hatari/src/keymap.c:63,
  hatari/src/keymap.c:699-718). The AVI recorder is compiled out and
  replaced by stubs (hatari/src/avi_record.c:102,
  hatari/src/avi_record.c:1535-1547), and File_Length, File_Lock and
  File_InputAvailable are removed with it (hatari/src/file.c:374,
  hatari/src/file.c:744, hatari/src/file.c:802).

  At retro_set_environment the core looks for <system>/tos.img and lists
  every entry of <system>/hatarib/, up to 128 files and 16 directories
  (core/core_file.c:13-14, core/core_file.c:791-851). Those lists fill the
  hatarib_tos, hatarib_cartridge and hatarib_hardimg options, 100 values
  each: TOS candidates end in .img, .rom, .bin or .tos, cartridges in .img,
  .rom, .bin or .cart, hard disks are any file or subdirectory
  (core/core_config.c:11, core/core_config.c:1318-1385). The TOS option
  defaults to <tos.img> when the file exists and to EmuTOS 192uk otherwise
  (core/core_config.c:68-92, core/core_config.c:1325-1340). The four
  special values select tos.img or one of the built-in images, any other
  value is a path under the system directory
  (core/core_config.c:1112-1135). TOS_LoadImage copies the built-in image
  or reads the file with core_read_file_system and caches it
  (hatari/src/tos.c:45-63, hatari/src/tos.c:1028-1078). A failed load
  raises a notification and halts the CPU instead of leaving
  (hatari/src/tos.c:1080-1086, hatari/src/tos.c:1250-1262,
  core/core.c:419-433, hatari/src/main.c:906-925). Validation is
  upstream's (hatari/src/tos.c:1114-1160), but TOS_CheckSysConfig only
  warns and never switches machine or CPU (hatari/src/tos.c:859-1000). The
  hatarib_emutos_region and hatarib_emutos_framerate options rewrite the
  OS header word of an EmuTOS image (hatari/src/tos.c:1351-1365,
  core/core_config.c:1181-1187). Symbols_LoadTOS still runs
  (hatari/src/tos.c:1193) but resolves <tos>.sym against the process
  working directory, so nothing is read from the system directory.

  The three EmuTOS images are EmuTOS 1.4 built from the hatarib-custom-140
  branch of bbbradsmith/emutos, which lets DESKTOP.INF and NEWDESK.INF be
  loaded, and are compiled in through emutos/bin_to_h.py
  (DEVELOP.md:10, README.md:324-326).

  A cartridge is read with core_read_file_system from the option value
  (hatari/src/cart.c:40, hatari/src/cart.c:57-100) and disabled with
  GEMDOS hard disk emulation, extended VDI or OS tracing
  (hatari/src/cart.c:108-147). A permanent hard disk comes from
  system/hatarib through hatarib_hardimg and hatarib_hardtype, GEMDOS
  folder, ACSI, SCSI or IDE (core/core_config.c:186-233,
  core/core_config.c:1018-1075, core/core_config.c:1169-1180). Temporary
  ones are content with an .acsi, .ahd, .vhd, .scsi, .shd, .ide or .gem
  extension or lines of an M3U (core/core_disk.c:16-23,
  core/core_disk.c:676-713, core/core_disk.c:782-785,
  core/core_config.c:1077-1105). Images open through core_file_open_hard
  (hatari/src/hdc.c:903, hatari/src/hdc.c:961-963,
  hatari/src/ide.c:663-666) and GEMDOS folders through core_scandir_hard
  (hatari/src/gemdos.c:672, hatari/src/gemdos.c:770,
  hatari/src/gemdos.c:1330). Hard disks are write protected by default
  (hatari/src/configuration.c:918). Floppy content is ST, MSA, DIM, STX,
  IPF or CTR, also inside a ZIP, ZST or GZ, or an M3U or M3U8 list with
  #BOOTA, #BOOTB, #AUTO and #RES directives (core/core_disk.c:14-24,
  core/core_disk.c:202-384, core/core_disk.c:444-559,
  core/core_disk.c:621-670). Before the original image the core takes a
  same-named copy from the save directory and, for STX, a .wd1772 overlay
  there (core/core_disk.c:787-814), and modified disks are written back to
  the save directory (core/core_disk.c:1154-1226, hatari/src/st.c:93,
  hatari/src/msa.c:417, hatari/src/floppy_stx.c:451). #AUTO and #RES
  write a virtual INF file to system/hatarib.tmp
  (hatari/src/inffile.c:761) and, when booting from a GEMDOS C: folder,
  read the DESKTOP.INF, NEWDESK.INF or EMUDESK.INF found there
  (hatari/src/inffile.c:598-667). MIDI goes through the libretro MIDI
  interface (core/core.c:485-545, hatari/src/midi.c:593-700), and Midi_Host_Open
  no longer opens files (hatari/src/midi.c:346-424).

files:
  - name: "tos.img"
    path: "tos.img"
    description: "Atari TOS ROM image, default when present"
    required: false
    has_builtin: true
    min_size: 64
    max_size: 1048576
    validation: [size]
    source_ref: "core/core_file.c:791-851, core/core_config.c:68-92, core/core_config.c:1112-1135, core/core_config.c:1325-1340, hatari/src/tos.c:1028-1160"
    note: >
      Any TOS 1.00 to 4.04, TOS 0.00, a RAM TOS or EmuTOS. Further images
      go in system/hatarib/ with an .img, .rom, .bin or .tos extension and
      are selected with the hatarib_tos option. Without tos.img the
      built-in EmuTOS 192uk is the default.

  - name: "etos1024k.img"
    description: "EmuTOS 1.4 1024 KB image, all machine types"
    required: false
    embedded: true
    size: 1048576
    md5: 1cb3775c4775bad75d24447a90a2890b
    sha1: 38dc8baf5224229df55e7d0804b6b7b6bacfc7a0
    sha256: 757c571b98b955887ea6d9034513555f4263040420e9d2195cd0c6f8de06c451
    crc32: 118b35b4
    source_ref: "emutos/bin_to_h.py:1-30, hatari/src/tos.c:45-63, hatari/src/tos.c:1038-1046, core/core_config.c:76, core/core_config.c:1114-1134"
    note: >
      Compiled into the core from emutos/etos1024k.img and never opened at
      run time. Built from the hatarib-custom-140 branch of
      bbbradsmith/emutos. Hashes are of the file in the repository.

  - name: "etos192uk.img"
    description: "EmuTOS 1.4 192 KB UK image, 50 Hz, default TOS"
    required: false
    embedded: true
    size: 196608
    md5: 5f5730d9b557c44ddb9bc410ce2925d8
    sha1: ef3a3ccffcb317bff7d0dceca0abacefc3a58abc
    sha256: 5c679e6b1b8ed178fa079e4957ed66f9277094f0fe0a5b50c8cbea041e220250
    crc32: fe4c3ff1
    source_ref: "emutos/bin_to_h.py:1-30, hatari/src/tos.c:45-63, hatari/src/tos.c:1038-1046, core/core_config.c:77, core/core_config.c:91, core/core_config.c:1114-1134"
    note: >
      Compiled into the core from emutos/etos192uk.img and never opened at
      run time. Selected when no tos.img exists and no other image is
      chosen. Built from the hatarib-custom-140 branch of
      bbbradsmith/emutos. Hashes are of the file in the repository.

  - name: "etos192us.img"
    description: "EmuTOS 1.4 192 KB US image, 60 Hz"
    required: false
    embedded: true
    size: 196608
    md5: 796f62574413bc59ca767063b3184f90
    sha1: bb98cd8a50df53afecfe183b049eda4014fc0d05
    sha256: ccccc420908012e03b4b38b8ed4530923bb04f27ab189eb2c694bf7e8509b666
    crc32: 18030f9a
    source_ref: "emutos/bin_to_h.py:1-30, hatari/src/tos.c:45-63, hatari/src/tos.c:1038-1046, core/core_config.c:78, core/core_config.c:1114-1134"
    note: >
      Compiled into the core from emutos/etos192us.img and never opened at
      run time. Built from the hatarib-custom-140 branch of
      bbbradsmith/emutos. Hashes are of the file in the repository.

  - name: "cartridge ROM"
    path: null
    config_key: "hatarib_cartridge"
    description: "Atari ST cartridge image loaded at 0xFA0000"
    required: false
    min_size: 40
    max_size: 131076
    validation: [size]
    source_ref: "core/core_config.c:166-185, core/core_config.c:1163-1167, core/core_config.c:1351-1363, core/core_file.c:256-259, hatari/src/cart.c:40, hatari/src/cart.c:57-100, hatari/src/cart.c:108-147"
    note: >
      Any file of system/hatarib/ with an .img, .rom, .bin or .cart
      extension. Raw images up to 0x20000 bytes or .stc images of exactly
      0x20004 bytes whose 4-byte header is skipped. Replaced by the
      built-in GEMDOS trampoline whenever GEMDOS hard disk emulation,
      extended VDI or OS tracing is on.

  - name: "hatarib.nvram"
    path: "hatarib.nvram"
    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 when the content closes, with no canonical contents"
    source_ref: "hatari/src/falcon/nvram.c:97, hatari/src/falcon/nvram.c:111-117, hatari/src/falcon/nvram.c:127-170, hatari/src/falcon/nvram.c:178-205, hatari/src/falcon/nvram.c:317-330, hatari/src/falcon/nvram.c:371-374, hatari/src/falcon/nvram.h:54-58, core/core_file.c:273-277, core/core_file.c:319-322"
    note: >
      Read from the system directory at NvRam_Init for the TT and Falcon
      machines only. A read shorter than 50 bytes keeps the built-in
      defaults. Written back when the core shuts down.

  - name: "capsimg.so"
    path: null
    description: "CAPSImage 5.1 shared library for IPF and CTR floppy images, Linux, macOS, Android and Raspberry Pi builds"
    required: false
    source_ref: "hatari/src/floppy_ipf.c:320-331, hatari/src/floppy_ipf.c:637-645, hatari/src/floppy_ipf.c:733-783, hatari/src/floppy_ipf.c:791-803, hatari/CMakeLists.txt:246, hatari/cmake/config-cmake.h:99-101, DEVELOP.md:56, DEVELOP.md:59"
    note: >
      Opened with dlopen on the first IPF or CTR read, from the dlopen
      search path or next to the core, and required to export the CAPS
      functions the core imports. Without it those images are refused
      with a notification and every other format still works.
      rsn8887/capsimg publishes one build per platform under this name.

  - name: "capsimg.dll"
    installed_on: [retrobat]
    path: null
    description: "CAPSImage 5.1 shared library for IPF and CTR floppy images, Windows build"
    required: false
    source_ref: "hatari/src/floppy_ipf.c:320-331, hatari/src/floppy_ipf.c:637-645, hatari/src/floppy_ipf.c:733-783, hatari/src/floppy_ipf.c:791-803, DEVELOP.md:56"
    note: >
      Opened with LoadLibrary on the first IPF or CTR read, from the
      RetroArch directory or the library search path. Without it those
      images are refused with a notification and every other format still
      works. RetroBat installs it in its bios folder, and its launcher copies
      it into the RetroArch directory before starting an IPF image.