Private company

IntervalZero

Logo: IntervalZero, Public domain, via Wikimedia Commons3

American company based in Waltham, founded in 20081

IntervalZero, Inc. develops hard real-time software and its symmetric multiprocessing (SMP) enabled RTX and RTX64 software transform the Microsoft Windows general-purpose operating system (GPOS) into a real-time operating system (RTOS). IntervalZero and its engineering group regularly release new software (cf its history).2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

2008Founded1

IntervalZero, Inc. develops hard real-time software and its symmetric multiprocessing (SMP) enabled RTX and RTX64 software transform the Microsoft Windows general-purpose operating system (GPOS) into a real-time operating system (RTOS).2

The story

In 1980, a group of Massachusetts Institute of Technology engineers started VenturCom and began to develop expertise in embedded technology. It was during this time that Venix was developed and marketed.

In 1995, VenturCom released RTX, extensions for Windows NT 4.0 intended for development of real-time applications using regular Windows development tooling. Since then, a lot of controllers are PC and Windows based.

In 1996, VenturCom released Component Integrator, a tool for deploying Windows NT-based embedded systems It was licensed by Microsoft in 1998 and became the origin of Windows NT Embedded.

In 2004, VenturCom, was renamed Ardence.

In December 2006, Citrix Systems announced an agreement to acquire Ardence's enterprise and embedded software businesses. It integrated the software streaming products into the Citrix portfolio in 2007 and early 2008.

In 2008, a group of former Ardence executives founded IntervalZero and acquired the Ardence embedded software business from Citrix Systems Inc. Citrix retained a minority ownership the firm.

On July 28, 2008, IntervalZero announced that it had acquired the Ardence embedded software division with Citrix Systems Inc.

From Wikipedia’s article on IntervalZero, shared under CC BY-SA 4.0.4

Products and brands

  • RTX

Listed on Wikidata.1

IntervalZero develops RTX and RTX64, hard real-time software that transforms Microsoft Windows into a real-time operating system (RTOS).

From Wikipedia’s article on IntervalZero, shared under CC BY-SA 4.0.4

Timeline

  1. 2008Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2
  3. 3
  4. 4