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Similar to a traditional acoustic piano, the defining feature of a digital piano is a musical keyboard with 88 keys. The keys are weighted to simulate the action of an acoustic piano and are velocity-sensitive so that the volume and timbre of a played note depends on how hard the key is pressed.
The Roland MKS-20 is a digital piano–type sound module released by Roland Corporation in 1986, simultaneously with the Roland RD-1000 digital stage piano.The MKS-20 and RD-1000 share the same "Structured/Adaptive Synthesis" sound engine; the RD-1000 integrates that engine into a musical keyboard-type MIDI controller with size, weight, and features similar to the Roland MKB-1000.
DIGITAL Command Language (DCL) is the standard command language adopted by many of the operating systems created by Digital Equipment Corporation.DCL had its roots in IAS, TOPS-20, and RT-11 and was implemented as a standard across most of Digital's operating systems, notably RSX-11 and RSTS/E, but took its most powerful form in VAX/VMS (later OpenVMS).