The Elusive 64-Bit RTOS for ED-12C/DO-178C DAL A Avionics

Avionics The Elusive 64-Bit RTOS for ED-12C/DO-178C DAL A Avionics

2026-05-11 From Richard Jaenicke, Green Hills Software 2 min Reading Time

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64-bit real-time operating systems remain rare in safety-critical avionics, but emerging certified solutions are beginning to unlock their performance and memory advantages under the stringent ED-12C/DO-178C DAL A standard.

Most software engineers take 64-bit architectures and operating systems for granted. Unix-style 64-bit operating systems have been around since 1993 with DEC Tru64 UNIX running on DEC Alpha CPU, and Windows XP 64-Bit Edition was released in 2001. Even real-time operating systems (RTOSs) have long had 64-bit support, starting with Green Hills INTEGRITY® RTOS running on DEC Alpha in 1999.

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