Explanation :
<p><strong>Palm OS</strong> is not a real-time operating system.</p><ul><li><strong>RTLinux</strong>, <strong>VxWorks</strong>, and <strong>QNX</strong> are all examples of real-time operating systems (RTOS):<ul><li><strong>RTLinux</strong> is a real-time Linux operating system.</li><li><strong>VxWorks</strong> is a real-time operating system developed by Wind River Systems.</li><li><strong>QNX</strong> is a real-time operating system primarily used in embedded systems.</li></ul></li></ul><p><strong>Palm OS</strong>, on the other hand, was an operating system developed by Palm, Inc., primarily for personal digital assistants (PDAs) and later smartphones. It was not designed as a real-time operating system.</p>
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