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mac os nanokernel wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 system 7 1 2 mac os 8 5 1 2 interim development 3 mac os 8 6 and later 4 references 5 external links toggle the table of contents mac os nanokernel 1 language 日本語 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia operating system kernel in powerpc computers this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources mac os nanokernel news newspapers books scholar jstor february 2012 learn how and when to remove this message this article may need to be rewritten to comply with wikipedia s quality standards relevant discussion may be found on the talk page you can help the talk page may contain suggestions july 2026 the mac os nanokernel is an operating system kernel that serves as the basis of most powerpc based system software versions 7 through 9 of the classic mac os predating mac os x the initial revision of this software is a single tasking system which delegates most tasks to an emulator running the motorola 68000 series 68k version of the operating system the second major revision supports multitasking multiprocessing and message passing and would be more properly called a microkernel unlike the 68k derived mac os kernel running within it the powerpc kernel exists in a protected memory space and executes device drivers in user mode the nanokernel is very different from the copland os microkernel although they were created in succession with similar goals 1 2 3 system 7 1 2 mac os 8 5 1 edit the original nanokernel and the tightly integrated mac 68k emulator were written by emulation consultant gary davidian 4 its main purpose is to allow the existing motorola 68k version of the operating system to run on new hardware as such the normal state of the system is to be running 68k code the operating system does little until activated by an interrupt which is quickly mapped to its 68k equivalent within the virtual machine other tasks may include switching back to powerpc mode if necessary upon completion of the interrupt handler and mapping the macintosh virtual memory system to the powerpc hardware however as the software is little documented these might instead be handled by the emulator running in user mode this nanokernel is stored on the mac os rom chip integrated into old world rom computers or inside the mac os rom file on disk on the new world rom computers rather than being installed in the familiar sense interim development edit progress after 1994 demanded additional functionality according to whom a forward looking architecture was introduced for pci card drivers in anticipation of the copland microkernel called nukernel which supports memory protection the open transport networking architecture introduced standardized powerpc synchronization primitives the daystar digital genesis mp macintosh clone requires kernel extensions to support multiprocessing this evolution would later affect the overhaul to the nanokernel in mac os 8 6 mac os 8 6 and later edit mac os 8 6 s nanokernel was rewritten by rené a vega to add multiprocessing services 2 0 support powermacinfo distributed in the multiprocessing sdk is an application that displays statistics about the nanokernel s operation 5 references edit inside macintosh powerpc system software apple technical library reading mass addison wesley pub co 1994 isbn 978 0 201 40727 3 oclc 29636881 inside macintosh powerpc system software apple technical library apple computer inc july 3 1996 archived from the original on may 18 2008 retrieved april 4 2013 technical note tn1084 running cfm 68k code at interrupt time is your code at risk apple computer inc march 27 1997 archived from the original on june 23 2004 retrieved april 4 2013 the road to power macintosh macworld vol 11 may 1994 rené a vega october 25 2001 powermacinfo info newsgroup comp sys mac programmer help retrieved may 12 2016 external links edit rené a vega s explanation of basic mac os architecture supervisor mode question from a non programmer v t e microkernels nanokernels kernels l4 family eumel l3 l4 macintosh hosted mac os nanokernel nukernel psion eka1 eka2 amiga type exec execsg quark warpos eros k42 little kernel mach gnu mach microempix µ velosity nucleus off plan b opus powerup rtlinux ti rtos kernel vanguard operating systems posix support unix like arx gnu hurd lites meikos minix minix vmd minix 3 mklinux multi environment real time mert unix rt os2000 qnx redoxos spring tinix unicos vsta partial chorusos integrity nucleus rtos nuttx ose riot capability based gnosis keykos eros capros hydra sel4 midori nltss harmonyos next openharmony oniro os harmonyos l4 kernel l 4 linux pikeos rex os wombat java virtual machine javaos chorus jazz integrates chorusos jx macintosh hosted unix like machten macmach copland classic mac os powerpc kernel psion epoc symbian os amiga type amigaos aros aspireos broadway icaros desktop morphos microsoft singularity threadx verve aim alliance pink taligent os workplace os amoeba bertos chibios rt freertos helenos µc os mqx opencomrtos phantom os rc 4000 sharpos spin thoth harmony v vrtx frameworks kits cosmos genode ti rtos developers gordon bell thomas bushnell david cheriton dan dodge per brinch hansen gernot heiser jochen liedtke james g mitchell ike nassi richard rashid andrew s tanenbaum avie tevanian william wulf italics discontinued real time open source software category microkernel based operating systems category microkernels retrieved from https en wikipedia org w index php title mac_os_nanokernel oldid 1362051105 categories nanokernels classic mac os hidden categories articles with short description short description matches wikidata articles needing additional references from february 2012 all articles needing additional references wikipedia articles needing rewrite from july 2026 all articles needing rewrite all articles with specifically marked weasel worded phrases articles with specifically marked weasel worded phrases from july 2026 this page was last edited on 1 july 2026 at 17 27 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to 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