High Quality Content by WIKIPEDIA articles! BASIC-PLUS was an extended dialect of the BASIC programming language developed by Digital Equipment Corporation (DEC) for use on its RSTS/E time-sharing operating system for the PDP-11 series of 16-bit minicomputers in the early 1970s through the 1980s. Users would sit at a terminal and type in programming language statements. The statements could either be entered into the system's command interpreter directly, or entered into a text editor, saved to a file, and loaded into the command interpreter from the file. Errors in source code were reported to the user immediately after the line was typed. The language system provided two modes of storage: A program could be stored on the system in an editable source file (a .BAS file) using the "SAVE" command, or Semi-compiled into a non-editable binary .BAC file by the "COMPILE" command. Source programs could be edited and run, similar to the BASIC interpreter which years later was included with the IBM PC in ROM. While the command interpreter had a "COMPILE" command, it was not a true native machine language compiler.

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