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Elektronika - BK-0010/BK-0011(M) (bk)


A port of the PDP11 emulator to libretro. This core emulates the Soviet Electronica BK computers series, including the BK-0010, BK-0010.01 and BK-0011(M), as well as the Terak 8510/a, which is a 1976 American PDP-11/03 platform that the Electronica BK series were designed after. The BK series computers were the first mass-produced, affordable personal computers in Russia in the 1980s and they had a tremendous effect on the development of the Russian-speaking software community, similar to the C64, ZX Spectrum and Atari 2600 communities elsewhere in the world. These computers will accept console commands in English but respond mostly in Russian, so this core is mostly of use to Russian-speaking users.

This is a core for Soviet (russian) Electronica BK series:

  • БК-0010
  • БК-0010.01
  • БК-0011(М)

You may read more about the series at

The author's (Leonid A. Broukhis) page can be found at here.

Additionally, it supports emulation of Terak 8510/a, which is a 1976 american PDP-11/03 platform and of which the Electronica BK series are indeed clones.

The Electronica BK computers were the first mass produced, affordable personal computers in Russia in the eighties of 20th century, and have had tremendous effect on the development of Russian-speaking software community. Every russian computer, hardware or ham radio geek born in seventies or eighties probably had one of those machines during their formational years. They are the C64s, ZX Spectrums and Atari 2600s of the now defunct USSR.

All of the BK machines accept console commands in English, but respond mostly in Russian.

Virtually all of BK schematics, documentation, hardware hacks and software has been preserved and is available on the internet. Unfortunately, most if not all of these things are only available in Russian.


The bk core has been authored by

  • Eric A. Edwards
  • Leonid A. Broukhis
  • emestee
  • arcade-mini
  • phcoder

The bk core is licensed under

A summary of the licenses behind RetroArch and its cores can be found here.


Content that can be loaded by the bk core have the following file extensions:

  • .bin

Databases WIP

RetroArch database(s) that are associated with the bk core:


Required or optional firmware files go in the frontend's system directory.

Filename Description md5sum
bk/B11M_BOS.ROM fe4627d1e3a1535874085050733263e7
bk/B11M_EXT.ROM dc52f365d56fa1951f5d35b1101b9e3f
bk/BAS11M_0.ROM 946f6f23ded03c0e26187f0b3ca75993
bk/BAS11M_1.ROM 1e6637f32aa7d1de03510030cac40bcf
bk/DISK_327.ROM 5015228eeeb238e65da8edcd1b6dfac7
bk/BASIC10.ROM 3fa774326d75410a065659aea80252f0
bk/FOCAL10.ROM 5737f972e8638831ab71e9139abae052
bk/MONIT10.ROM 95f8c41c6abf7640e35a6a03cecebd01


Frontend-level settings or features that the bk core respects.

Feature Supported
Core Options
RetroArch Cheats
Native Cheats
Disk Control
Crop Overscan


The bk core's library name is 'bk'

The bk core saves/loads to/from these directories.

Geometry and timing

  • The bk core's core provided FPS is 25.
  • The bk core's core provided sample rate is 44100 Hz.
  • The bk core's base width is 1080.
  • The bk core's base height is 1080.
  • The bk core's core provided aspect ratio is 1/1.

Core options

The bk core has the following option(s) that can be tweaked from the core options menu. The default setting is bolded.

Settings with (Restart) means that core has to be closed for the new setting to be applied on next launch.

  • Model (restart) [bk_model] (BK-0010|BK-0010.01|BK-0010.01 + FDD|BK-0011M + FDD|Terak 8510/a|Slow BK-0011M)

  • Peripheral (UP port, restart) [bk_peripheral] (none|covox|ay_3_8910|mouse_high|mouse_low|joystick)

  • Keyboard layout [bk_layout] (qwerty|jcuken)

  • Double CPU speed [bk_doublespeed] (disabled|enabled)

  • Use color display [bk_color] (enabled|disabled)

  • Keyboard type (restart) [bk_keyboard_type] (poll|callback)

  • Aspect ratio [bk_aspect_ratio] (1:1|4:3)


The bk core supports the following device type(s) in the controls menu, bolded device types are the default for the specified user(s):

User 1 device types

  • None - Doesn't disable input. There's no reason to switch to this.
  • Joystick - Joypad
  • RetroKeyboard - Keyboard - Keyboard inputs are always active. Has keymapper support.
  • RetroPad Keyboard Map - Joypad - Awaiting description.

Controller tables


RetroKeyboard Inputs RetroKeyboard
Keyboard Backspace BACKSPACE
Keyboard Tab TAB
Keyboard Return RETURN
Keyboard Pause PAUSE
Keyboard Escape ESCAPE
Keyboard Space SPACE
Keyboard Quote ' COLON
Keyboard Comma , COMMA
Keyboard Minus - NEGATIVE
Keyboard Period . PERIOD
Keyboard Slash / DIVIDE
Keyboard 0 0
Keyboard 1 1, Player 1 Coleco #0
Keyboard 2 2, Player 1 Coleco #9
Keyboard 3 3, Player 2 Coleco #0
Keyboard 4 4, Player 2 Coleco #9
Keyboard 5 5
Keyboard 6 6
Keyboard 7 7
Keyboard 8 8
Keyboard 9 9
Keyboard Semicolon ; SEMICOLON
Keyboard Equals = CIRCUMFLEX
Keyboard Left Bracket [ LEFT BRACKET
Keyboard Backslash \ BACKSLASH (YEN)
Keyboard Right Bracket ] RIGHT BRACKET
Keyboard Backquote ` AT
Keyboard a A
Keyboard b B
Keyboard c C
Keyboard d D
Keyboard e E
Keyboard f F
Keyboard g G
Keyboard h H
Keyboard i I
Keyboard j J
Keyboard k K
Keyboard l L
Keyboard m M
Keyboard n N
Keyboard o O
Keyboard p P
Keyboard q Q
Keyboard r R
Keyboard s S
Keyboard t T
Keyboard u U
Keyboard v V
Keyboard w W
Keyboard x X
Keyboard y Y
Keyboard z Z
Keyboard Delete DELETE
Keyboard Keypad 0 NUMPAD 0
Keyboard Keypad 1 NUMPAD 1
Keyboard Keypad 2 NUMPAD 2
Keyboard Keypad 3 NUMPAD 3
Keyboard Keypad 4 NUMPAD 4
Keyboard Keypad 5 NUMPAD 5
Keyboard Keypad 6 NUMPAD 6
Keyboard Keypad 7 NUMPAD 7
Keyboard Keypad 8 NUMPAD 8
Keyboard Keypad 9 NUMPAD 9
Keyboard Keypad Period . NUMPAD COMMA
Keyboard Keypad Divide / NUMPAD DIVIDE
Keyboard Keypad Multiply * NUMPAD MULTIPLY
Keyboard Keypad Minus - NUMPAD SUBTRACTION
Keyboard Keypad Plus + NUMPAD ADD
Keyboard Keypad Enter NUMPAD PERIOD
Keyboard Up UP
Keyboard Down DOWN
Keyboard Right RIGHT
Keyboard Left LEFT
Keyboard Insert INSERT
Keyboard Home CLS
Keyboard End STOP
Keyboard Page Up SELECT
Keyboard F1 F1
Keyboard F2 F2
Keyboard F3 F3
Keyboard F4 F4
Keyboard F5 F5
Keyboard Caps Lock CAPS
Keyboard Right Shift RIGHT SHIFT
Keyboard Left Shift LEFT SHIFT
Keyboard Left Control CONTROL
Keyboard Left Alt GRAPH
Keyboard Print PRINT

Supported combinations