Editing Electronika BK (section)

===Versions===
====BK-0010====
[[File:Компьютер БК0010 фото3.JPG|thumb|right|BК-0010 model]]
[[File:Bk0010-01-systemboard.jpg|thumb|right|BK0010-01 system board]]
The {{lang|ru|'''Электроника БК-0010'''}} is the first model (originally released in 1983, serial production started in 1985). It has a pseudo-[[membrane keyboard]] (an array of mechanical microswitches without keycaps, covered by flexible overlay), 32 [[KiB]] RAM, 8 KiB ROM with BIOS (chip K1801RE2-017), 8 KiB ROM with [[FOCAL (programming language)|FOCAL]] [[Interpreter (computing)|interpreter]] (K1801RE2-018), 8 KiB ROM with debugger (K1801RE2-019) and one free ROM slot, and its CPU is clocked at 3 MHz. A [[tape recorder]] is used for data storage in the factory configuration.

This model was criticized for its uncomfortable keyboard – while [[Keyboard technology#Mechanical-switch keyboard|mechanical]] in nature, lack of keycaps lead to the same unsatisfactory tactile response, that was seen as unacceptable when the machine was used in home or educational settings, although such keyboard could be easily sealed fully, so this version found wide use as an [[Industrial PC|industrial controller]]. Other points of criticism included the FOCAL programming language supplied by default instead of the more common BASIC and the lack of peripherals and software. While all hardware was well-documented and easy to work with, the machine was delivered with no programming tools.

====BK-0010.01====
The follow-up version, '''БК-0010.01''' (sometimes referred to as -0010-01), is essentially the same machine, but with a conventional full-travel keyboard and a [[Vilnius BASIC]] [[p-code machine|p-code]] [[compiler]] in the ROM, correcting the weakest points of its predecessor. While the BASIC dialect used is powerful and well-optimized (it is a scaled-down clone of [[MSX BASIC]]), the keyboard still has shortcomings. While it is much more comfortable to work with, the keys were prone to sticking, significant [[Switch#Contact bounce|bounce]] and wore quickly, though a model with a further improved keyboard became available later. The FOCAL interpreter was not dropped but instead shipped on an external [[ROM cartridge]] that can be inserted into the Q-Bus slot.

====BK-0010Sh====
{{lang|ru|'''Электроника БК-0010Ш'''}} is a model intended for school use. It can be either the −0010 or −0010.01 model but includes a special [[current loop]] network adapter rated at 19200 [[bits per second]] (bit/s), which can be inserted into the [[Q-Bus]] slot. Based on ULA chip K1801VP1-035 (and later on K1801VP1-065), the adapter is compatible with [[Digital Equipment Corporation]] (DEC) DL-11 and KL-11 serial interfaces, but without modem control bits. It also includes a monitor, usually a modified Yunost' compact TV for school settings.

====BK-0011====
'''BK-0011''' was released in 1989. It has 128 KiB of RAM divided into 16 KiB pages; its CPU is clocked at 4 MHz by default. It includes a newer version of BASIC in ROM and 16 selectable video palettes, which were almost universally criticized by users for their odd color combinations. It has a floppy controller, with the drive available as an add-on.

====BK-0011M====
[[File:БК0010М белый корпус.JPG|thumb|The BK0011M white case]]
[[File:Bk0011m.jpg|thumb|The BK0011M black case]]
Some changes in the BK-0011, while minor, made it incompatible with earlier -0010 models. It cannot load 0010 programs from a cassette tape. Even if it could have loaded them, crucial subsystems, such as sound, are still incompatible. The manufacturer redesigned the machine, restoring compatibility with earlier models. The resulting model, the BK-0011M, quickly went into production, and most BK-0011 series computers are actually BK-0011Ms. Since the modifications were minor, most of the handful of -0011 models that made it to market have been upgraded to -0011M models by enthusiasts.