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Most BK owners expanded the built-in RAM to at least 64 KiB, 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. The manufacturer also closely copied the PDP's internal architecture. Each model has one free card slot which is electrically, but not mechanically, compatible with Q-Bus.
That is extended to KiB in later models, with video memory extended to two 16 KiB pages. Later models has 16 hardwired 4-color sets selectable from 64 color palette.
Sound on all models is initially through a simple programmable counter connected to an onboard piezo speaker. Later, the General Instrument AY became a popular aftermarket addition. Later models includes a manufacturer-supplied floppy drive controller that can be plugged into a Q-Bus slot by default. It was available for earlier models as an aftermarket part, but homebrew ones that also often extends rather anemic 16K memory of original BK are more popular.
A cottage industry for such peripherals and mods flourished. A tape recorder is used for data storage in the factory configuration. This model was criticized for its uncomfortable keyboard — while 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 completely, so this version found widespread use as an industrial controller.
Other points of criticism included the archaic FOCAL programming language supplied by default and the complete lack of peripherals and software. While all hardware was well documented and easy to work with, the machine was delivered without any programming tools. While it is much more comfortable to work with, its quality left much to be desired, and the keys were prone to sticking, significant bounce and wore quickly, though a model with a further improved keyboard became available later.View credits, reviews, tracks and shop for the Cassette release of Tape #30 on Discogs.4/4(1).