Editing NuBus (section)

==Implementations==
[[File:Nubus-ppc950.jpg|thumb|Close-up of the NuBus 90 connectors in a [[Macintosh Quadra 950]]]]
The NuBus became an [[IEEE]] standard in 1987 as '''IEEE 1196'''. This version used a standard [[DIN 41612]] 96-pin three-row connector, running the system on a 10&nbsp;MHz clock for a maximum burst throughput of 40 MB/s and average speeds of 10 to 20 MB/s. A later addition, '''NuBus 90''', increased the clock rate to 20&nbsp;MHz for better throughput, burst increasing to about 70 MB/s, and average to about 30 MB/s.

The NuBus was first developed commercially in the [[NuMachine|Western Digital NuMachine]], and first used in a production product by their licensee, [[Lisp Machines, Inc.]], in the LMI-Lambda, a [[Lisp Machine]].  The project and the development group was sold by Western Digital to Texas Instruments in 1984.  The technology was incorporated into their [[TI Explorer]], also a [[Lisp Machine]]. In 1986, Texas Instruments used the NuBus in the S1500 multiprocessor UNIX system. Later, both Texas Instruments and [[Symbolics]] developed Lisp Machine NuBus boards (the TI MicroExplorer and the Symbolics MacIvory) based on their Lisp supporting microprocessors. These NuBus boards were co-processor Lisp Machines for the Apple [[Mac (computer)|Macintosh]] line (the Mac II and Mac Quadras).

NuBus was also selected by [[Apple Computer]] for use in their [[Macintosh II]] project, where its plug-n-play nature fit well with the Mac philosophy of ease-of-use.<ref>[http://docs.info.apple.com/article.html?artnum=112168 Macintosh II technical specifications] {{Webarchive|url=https://web.archive.org/web/20080410162408/http://docs.info.apple.com/article.html?artnum=112168 |date=2008-04-10 }} at apple.com</ref> It was used in most of the [[Macintosh II series]] that made up the professional-level Mac lineup from the late 1980s. It was upgraded to NuBus 90 starting with the [[Macintosh Quadra]]s and used into the mid-1990s. Early Quadras only supported the 20&nbsp;MHz rate when two cards were talking to each other, since the motherboard controller was not upgraded. This was later addressed in the NuBus implementation on the [[Macintosh Quadra 660AV|660AV]] and [[Macintosh Quadra 840AV|840AV]] models. This improved NuBus controller was used in the first generation [[Power Macintosh 6100]], [[Power Macintosh 7100|7100]] and [[Power Macintosh 8100|8100]] models. Later Power Mac models adopted [[Intel]]'s [[Peripheral Component Interconnect|PCI]] bus. Apple's NuBus implementation used pin and socket connectors on the back of the card rather than  [[edge connector]]s with Phillips screws inside the case that most cards use, making it much easier to install cards. Apple's computers also supplied an always-on +5 V "trickle" power supply for tasks such as watching the phone line while the computer was turned off. This was apparently part of an unapproved NuBus standard.

NuBus was also selected by [[NeXT Computer]] for their line of machines, but used a different physical [[Printed circuit board|PCB]] layout. NuBus appears to have seen little use outside these roles, and when Apple switched to [[Peripheral Component Interconnect|PCI]] in the mid-1990s, NuBus quickly disappeared.