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RetroBIOS

bk-emulator

bk-emulator emulates Elektronika BK. It reads 9 files, 1 of them required: without a required file it does not start games.

About this profile
Detail Value
Type libretro
Classification Community fork
Source https://github.com/libretro/bk-emulator
Upstream https://github.com/emestee/bk-emulator
Version v1.0, stated in libretro.c
Revision libretro/bk-emulator@92042a753289
Profiled 2026-03-23
Profile YAML, JSON
Cores bk
Systems Elektronika BK
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator bk
Platform details

  • bios_mapping:

    • source_ref: libretro.c:718-760, boot.c:83-116
    • note: ROM directory is {system_dir}/bk/ (libretro.c:724-726). Model selection via core option "bk_model" determines which ROMs are loaded. The core shuts down immediately if any required ROM for the selected model is not found.

  • model_rom_map:

    • source_ref: libretro.c:734-756, boot.c:83-116
    • note: BK-0010: MONIT10.ROM + FOCAL10.ROM BK-0010.01: MONIT10.ROM + BASIC10.ROM BK-0010.01 + FDD: MONIT10.ROM + DISK_327.ROM BK-0011M + FDD: B11M_BOS.ROM + DISK_327.ROM + BAS11M_0.ROM + BAS11M_1.ROM + B11M_EXT.ROM Slow BK-0011M: same as BK-0011M + FDD Terak 8510/a: TERAK.ROM

  • rom_loading:

    • source_ref: libretro.c:1050-1107
    • note: load_rom_file() first tries {romdir}/{filename} with original casing. If not found, retries with the filename converted to lowercase. Returns NULL and shuts down the core on failure.
Technical notes

Files go in {system_dir}/bk/. Each BK model requires a specific set of ROMs. The default model is BK-0010 which needs MONIT10.ROM and FOCAL10.ROM. Changing the core option "bk_model" changes which ROMs are loaded. The core shuts down if a required ROM is missing (no fallback or pseudo-BIOS). If a ROM file with uppercase name is not found, the core retries with the filename lowercased.

Files

Section titled “Files”

9 files: 1 required, 8 optional.

In this collection: 9 in repo and 0 missing.

Required

Section titled “Required”
FileStatus

MONIT10.ROM

  • Path: bk/MONIT10.ROM
  • Aliases: monit10.rom
  • BK-0010 monitor ROM (8 KB). Loaded at address 0100000. Required for all BK-0010 models (0, 1, 2).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:53 (emulator code, libretro port), boot.c:107 (emulator code, libretro port)
in repo

Optional

Section titled “Optional”
FileStatus

FOCAL10.ROM

  • Path: bk/FOCAL10.ROM
  • Aliases: focal10.rom
  • FOCAL interpreter ROM (24448-24576 bytes). Loaded at 0120000. Used by BK-0010 (model 0, default).
Validation and source
  • Validation: size
  • Asked for by: libretro glue and emulator code, libretro port
  • Source: libretro.c:15 (libretro glue), boot.c:110 (emulator code, libretro port)
in repo

BASIC10.ROM

  • Path: bk/BASIC10.ROM
  • Aliases: basic10.rom
  • BASIC interpreter ROM (24448-24576 bytes). Loaded at 0120000. Used by BK-0010.01 (model 1).
Validation and source
  • Validation: size
  • Asked for by: libretro glue and emulator code, libretro port
  • Source: libretro.c:16 (libretro glue), boot.c:110 (emulator code, libretro port)
in repo

DISK_327.ROM

  • Path: bk/DISK_327.ROM
  • Aliases: disk_327.rom
  • Floppy disk controller ROM (4 KB). Loaded at 0160000 for BK-0010.01+FDD (model 2), or into system_rom for BK-0011M (model 3/4).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:54 (emulator code, libretro port), boot.c:99 (emulator code, libretro port), boot.c:113 (emulator code, libretro port)
in repo

B11M_BOS.ROM

  • Path: bk/B11M_BOS.ROM
  • Aliases: b11m_bos.rom
  • BK-0011M system ROM / BOS (8 KB). Loaded into system_rom at offset 0. Required for BK-0011M (model 3/4).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:55 (emulator code, libretro port), boot.c:98 (emulator code, libretro port)
in repo

B11M_EXT.ROM

  • Path: bk/B11M_EXT.ROM
  • Aliases: b11m_ext.rom
  • BK-0011M extended BOS ROM (8 KB). Loaded into rom[1] at offset 8192. Required for BK-0011M (model 3/4).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:56 (emulator code, libretro port), boot.c:102 (emulator code, libretro port)
in repo

BAS11M_0.ROM

  • Path: bk/BAS11M_0.ROM
  • Aliases: bas11m_0.rom
  • BK-0011M BASIC ROM part 0 (16 KB). Loaded into rom[0]. Required for BK-0011M (model 3/4).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:57 (emulator code, libretro port), boot.c:100 (emulator code, libretro port)
in repo

BAS11M_1.ROM

  • Path: bk/BAS11M_1.ROM
  • Aliases: bas11m_1.rom
  • BK-0011M BASIC ROM part 1 (8 KB). Loaded into rom[1] at offset 0. Required for BK-0011M (model 3/4).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: main.c:58 (emulator code, libretro port), boot.c:101 (emulator code, libretro port)
in repo

TERAK.ROM

  • Path: bk/TERAK.ROM
  • Aliases: terak.rom
  • Terak 8510/a boot ROM (128 bytes). Used when model is set to Terak 8510/a (model 9).
Validation and source
  • Validation: size
  • Asked for by: emulator code, libretro port
  • Source: boot.c:94 (emulator code, libretro port)
in repo

Next steps

Section titled “Next steps”
.

Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.