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## MacOS 11.0 Big Sur
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Apple has released MacOS 11.0 "Big Sur". This OS includes compatibilty for Apple's new 'Apple Silicon' ARM-based computers as well as numerous changes and security enhancements. Because this is a major update, we reccommend waiting to upgrade any system required for scientific data processing. MacOS 10.14 "Mojave" or 10.15 "Catalina" are currently supported by SBGrid.
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### Apple M1 Silicon
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ARM64 compatibility
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-There won’t be any support for native ARM64 installation for a while. We are not aware of any SBGrid supported applications that are available for native execution on Apple M1 CPUs at this time. Access to new Apple hardware is still limited - we don't have an M1 mac yet.Compilation for M1 will likely require updated versions of GCC for some applications and their dependencies, which is also not currently available.
+Apple released the first of its new ARM64 "apple silicon" macs this month. We are testing the SBGrid software stack on the M1 chip and, so far, compatibility and performance look very good. Most of the SBGrid applications work on the new M1 CPU with macOS 11 and Apple's Rosetta compatibility environment. Standards like COOT, PyMOL, Chimera, CCP4, and PHENIX work seamlessly, but there are exceptions (CCPEM, RELION). We expect to support most titles on BigSur with the new M1 hardware early in 2021.
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### Known issues
+ - Rosetta ( Baker lab version) fails
+ - CCP-EM ( possibly fixed in latest nightly)
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- No compatible release of Schrodinger
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- No GUI in FLTK applications (like RELION)
+ - Xquartz window border takes a few seconds to appear. It does appear eventually.