High Quality Content by WIKIPEDIA articles! xcalc is an on-screen calculator program for the X Window System. It can be used in algebraic mode or in reverse polish notation. Early versions also featured a slide rule mode, but this was removed for X11R4, which was released in 1989. The sliderule program for the BSD operating systems is based on the slide rule in xcalc. Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the UNIX operating system derivative developed and distributed by the Computer Systems Research Group (CSRG) of the University of California, Berkeley, from 1977 to 1995.

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