In 1994, NYCSubway.org released Greenberg’s NXSYS – a design environment for, and simulator of, the control signals used by the New York City Transit Authority’s signaling and control networks. The current version of NXSYS is a Microsoft Windows application that makes use of the OpenGL API to provide an interactive 3D view from the perspective of a New York subway motorman. According to the online documentation, the NXSYS “relay language” is a subset of Lisp that describes subway track systems and control signal pathways; the subway simulation is actually run by the Lisp program, compiled by NXSYS, from the relay language source.
Together with Thomas Milo, Greenberg is the author of Basis Technology's Arabic Editor. It handles, among others, an improved version of the DMG (deutsche morgenländische Gesellschaft) transcription method, to introduce the concept of reversible transcription and semi-reversible transliteration for Arabic text.
- Bernard S. Greenberg. Multics Emacs: The History, Design and Implementation, http://www.multicians.org/mepap.html
- Multics Lisp (Multics MacLisp) (SoftwarePreservation.org)
- Jamie Zawinski's Emacs Timeline
- Condition System, Revision #18 by Kent Pitman (12-Mar-88)
- Blog entry (11-Nov-2007) by Daniel Weinreb
- NYCSubway.org — Subway Signals: A Complete Guide: Bernard S. Greenberg. NXSYS, Signalling and Interlocking Simulator, http://www.nycsubway.org/wiki/NXSYS,_Signalling_and_Interlocking_Simulator#Download (Retrieved 22-Feb-2013)
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