Now we are looking on the crossword clue for: It’s calculated relative to the speed of sound.
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Possible Answers:
MACH.
Last seen on: NY Times Crossword 30 Sep 21, Thursday
Random information on the term “MACH”:
Mach (/mɑːk/) is a kernel developed at Carnegie Mellon University by Richard Rashid and Avie Tevanian and derived originally from 4.3BSD to support operating system research, primarily distributed and parallel computing. Mach is often mentioned as one of the earliest examples of a microkernel. However, not all versions of Mach are microkernels. Mach’s derivatives are the basis of the operating system kernel in GNU Hurd and of Apple’s XNU kernel used in macOS, iOS, iPadOS, tvOS, and watchOS.
The project at Carnegie Mellon ran from 1985 to 1994, ending with Mach 3.0, which is a true microkernel. Mach was developed as a replacement for the kernel in the BSD version of Unix, so no new operating system would have to be designed around it. Mach and its derivatives exist within a number of commercial operating systems. These include all using the XNU operating system kernel which incorporates an earlier non-microkernel Mach as a major component. The Mach virtual memory management system was also adopted in 4.4BSD by the BSD developers at CSRG, and appears in modern BSD-derived Unix systems, such as FreeBSD.