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====== Elektronika BK ======
The Elektronika BK (Russian: Электроника БК, where БК stands for "Бытовой Компьютер" / "Home Computer") is a series of 16-bit [[wp>PDP-11|PDP-11]]-compatible home computers developed by NPO Scientific Center in the Soviet Union. It was the only official government-approved Soviet home computer in mass production, released in 1985. The BK-0010 sold for approximately 600 roubles (about 4 months' average salary at the time).

The BK series includes:
  * **BK-0010** (1985) - Original model with FOCAL interpreter in ROM, membrane keyboard
  * **BK-0010.01** - Revised model with mechanical keyboard and BASIC in ROM
  * **BK-0011** (1989) - Upgraded RAM (128 KB) and CPU speed (4 MHz)
  * **BK-0011M** - Improved BK-0011 with better BK-0010 software compatibility

The BK had a tremendous effect on the development of the Russian-speaking software community, similar to the roles of the C64 and ZX Spectrum elsewhere.

This system scrapes metadata for the "bk" group(s) and loads the ''bk'' set from the currently selected theme, if available.
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==== Quick reference ====
  * **Emulator:** [[#retroarch|RetroArch]], [[#mame|MAME]]
  * **Core:** [[#libretro:_bk|libretro: bk]], [[#libretro:_mame|libretro: MAME]]
  * **Folder:** ''/userdata/roms/bk''
  * **Accepted ROM formats:** ''.bin'', ''.img'', ''.dsk'', ''.bkd'', ''.zip'', ''.7z''

===== BIOS =====
BK-0011M BIOS files:

^ MD5 checksum ^ Share file path ^ Description ^
| ''fe4627d1e3a1535874085050733263e7'' | ''bios/bk/B11M_BOS.ROM'' | BK-0011M BOS ROM |
| ''dc52f365d56fa1951f5d35b1101b9e3f'' | ''bios/bk/B11M_EXT.ROM'' | BK-0011M EXT ROM |
| ''946f6f23ded03c0e26187f0b3ca75993'' | ''bios/bk/BAS11M_0.ROM'' | BK-0011M BASIC ROM (part 0) |
| ''1e6637f32aa7d1de03510030cac40bcf'' | ''bios/bk/BAS11M_1.ROM'' | BK-0011M BASIC ROM (part 1) |
| ''5015228eeeb238e65da8edcd1b6dfac7'' | ''bios/bk/DISK_327.ROM'' | BK-0011M Disk controller ROM |

BK-0010 BIOS files:

^ MD5 checksum ^ Share file path ^ Description ^
| ''3fa774326d75410a065659aea80252f0'' | ''bios/bk/BASIC10.ROM'' | BK-0010 BASIC ROM |
| ''5737f972e8638831ab71e9139abae052'' | ''bios/bk/FOCAL10.ROM'' | BK-0010 FOCAL ROM |
| ''95f8c41c6abf7640e35a6a03cecebd01'' | ''bios/bk/MONIT10.ROM'' | BK-0010 Monitor ROM |

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Which BIOS files are needed depends on the selected model. BK-0011M + FDD (the default) requires the BK-0011M set. BK-0010 requires the BK-0010 set. You can verify your BIOS files from the Batocera menu: **GAME SETTINGS > MISSING BIOS CHECK**.
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===== ROMs =====
Place your Elektronika BK ROMs in ''/userdata/roms/bk''.

Software for the BK was distributed primarily on cassette tapes and later on floppy disks. Common formats include disk images (.dsk, .bkd, .img) and raw binary dumps (.bin).

===== Emulators =====
==== RetroArch ====
[[https://docs.libretro.com/|RetroArch]] (formerly SSNES), is a ubiquitous frontend that can run multiple "cores", which are essentially the emulators themselves. The most common cores use the [[https://www.libretro.com/|libretro]] API, so that's why cores run in RetroArch in Batocera are referred to as "libretro: (core name)". RetroArch aims to unify the feature set of all libretro cores and offer a universal, familiar interface independent of platform.

=== RetroArch configuration ===
RetroArch offers a **Quick Menu** accessed by pressing ''[HOTKEY]'' + {{:wiki:south.png?nolink&20|South button (B SNES)}} which can be used to alter various things like [[:advanced_retroarch_settings|RetroArch and core options]], and [[:remapping_controls_per_emulator|controller mapping]]. Most RetroArch related settings can be altered from Batocera's EmulationStation.

Standardized features available to all libretro cores: ''bk.videomode'', ''bk.ratio'', ''bk.smooth'', ''bk.shaders'', ''bk.decoration'', ''bk.game_translation''

=== libretro: bk ===
The [[https://docs.libretro.com/library/bk/|libretro bk core]] is a dedicated Elektronika BK emulator. It supports BK-0010, BK-0010.01, BK-0011(M) and Terak 8510/a emulation.

== libretro: bk configuration ==
Standardized features for this core: ''bk.rewind'', ''bk.autosave''

^ ES setting name ''batocera.conf_key'' ^ Description => ES option ''key_value'' ^
^ Settings that apply to all systems this core supports ||
| **MODEL ''bk.bk_model''** | Select the BK model to emulate. Requires restart.\\ => BK-0010 ''BK-0010'', BK-0010.01 ''BK-0010.01'', BK-0010.01 + FDD ''BK-0010.01 + FDD'', BK-0011M + FDD ''BK-0011M + FDD'', Terak 8510/a ''Terak 8510/a'', Slow BK-0011M ''Slow BK-0011M''. |
| **PERIPHERAL (UP PORT) ''bk.bk_peripheral''** | Select peripheral device connected to the UP port.\\ => None ''none'', Covox ''covox'', AY-3-8910 ''ay_3_8910'', Mouse (high) ''mouse_high'', Mouse (low) ''mouse_low'', Joystick ''joystick''. |

=== libretro: MAME ===
The libretro version of [[https://www.mamedev.org/|MAME]] can also be used to emulate the Elektronika BK. It uses MAME BIOS and ROM sets.

==== MAME ====
Standalone [[https://www.mamedev.org/|MAME]] can also be used as an alternative emulator for the Elektronika BK.

===== Controls =====
The Elektronika BK is a computer system, so it primarily uses a **keyboard** for input. A physical USB keyboard is strongly recommended for the best experience.

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When using the libretro bk core, a joystick can be enabled via the **PERIPHERAL** core option.
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===== Troubleshooting =====
==== Black screen on boot ====
Make sure the correct BIOS files are in ''/userdata/bios/bk/''. The required files depend on the model selected in core options (BK-0010 vs BK-0011M). Use **GAME SETTINGS > MISSING BIOS CHECK** to verify.

==== Wrong model selected ====
Some software only works with specific BK models. If a program doesn't load or crashes, try switching the model in the core options (e.g. from BK-0011M to BK-0010.01 or vice versa).

==== Further troubleshooting ====
For further troubleshooting, refer to the [[:support|generic support pages]].