This typically depends on the ATM. Most times ATMs will use proprietary (their own) software to increase security. However, other automated machines such as Redbox look as if they run on a Windows XP or Linux based operating system, you can tell by the cursor and the buggy interface.
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The operating system commonly used in ATMs (Automated Teller Machines) is usually a specialized version of Windows, such as Windows Embedded or Windows CE. These operating systems provide a secure and stable platform for ATM software to run on. Additionally, they offer features like touch screen support, security enhancements, and remote management capabilities to ensure the smooth operation of ATMs.