Software
Although the BK series was included in a governmental economic plan, customer support apparently was not, as it was essentially a barebones machine, without any peripherals or development tools. The only software available at the launch (except ROM firmware) was an included magnetic tape with an early version of BASIC, several programming examples (both for BASIC and FOCAL), and several tests. The ROM firmware included a simple program to enter machine codes, BASIC and FOCAL interpreters.
While the BK was somewhat compatible with larger and more expensive DVK professional model microcomputers and industrial minicomputers like the SM EVM series, its meager 32 KB memory of which only 16 KB was generally available to programmers (an extended memory mode supported 28 KB but limited video output to a quarter of the screen) generally precluded direct use of software for the more powerful machines. Nevertheless, the DVK became a popular development platform for BK software, and when the BK memory was later extended to 128 KB, most DVK software could be used directly with minimal changes.
Homebrew developers quickly filled this niche, porting several development tools from DVK and UKNC. This led to an explosion of homebrew software, from Text editors and databases to operating systems and games. Most BK owners expanded the built-in RAM to at least 64 KB, which not only allowed easier software porting from more "grownup" systems, but as these upgrades often included floppy drive controllers, creating a one's own disk operating system became something of a competitive sport in the BK scene. Games and demo communities also flourished, as its anemic graphics were offset by a powerful CPU.
One of the operating systems was ANDOS, although officially the computer was shipped with OS BK-11, a modification of RT-11.
Read more about this topic: Electronika BK