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The bootloading code was originally derived from Linux 1.2.1. The source code of MemTest86 (BIOS version) and of the MemTest86+ fork is released under the GNU General Public License (GPL). MemTest86 is written in C and x86 assembly. As of February 2023 the latest version of Memtest86+ is 6.10. After MemTest86 remained at version 3.0 (2002 release) for two years, Samuel Demeulemeester created the Memtest86+ fork to add support for newer CPUs and chipsets. MemTest86 was developed by Chris Brady in 1994. Each tries to verify that the RAM will accept and correctly retain arbitrary patterns of data written to it, that there are no errors where different bits of memory interact, and that there are no conflicts between memory addresses.

MemTest86 and Memtest86+ are memory test software programs designed to test and stress test an x86 architecture computer's random-access memory (RAM) for errors, by writing test patterns to most memory addresses, reading back the data, and comparing for errors.

For apple download Memtest86 Pro 10.5.1000