While the BK was somewhat compatible with larger and more expensive DVK professional model microcomputers and industrial minicomputers like the SM EVM series, its 32 KiB memory - of which only 16 KiB was generally available to programmers - (an extended memory mode supported 28 KiB, but limited video output to a quarter of the screen) generally precluded direct use of software for the more powerful machines. The DVK became a popular development platform for BK software, and when the BK memory was later extended to 128 KiB, most DVK software could be used directly with minimal changes.