This page describes the pinout and signal names for NuBus as used on
Apple computers [Macintosh and NeXT Computer].
The NUbus expansion interface is obsolete and should not be used for new
designs. NUbus is a 32-bit bus and was defined by IEEE Std 1196-1987.
NuBus was used as an Apple expansion bus with 32 bit address and 32 bit data bus operating at
10MHz, with a throughput of 40MBps.
The NuBus card had a form factor of 12" x 7", and used a standard 96-pin
three-row (VME)
connector.
NuBus90, increased the clock rate to 20Mhz providing a throughput of
70Mbps. NUbus was replaced by the PCI expansion bus.
Additional pinout tables for other Apple protocols are listed on the
Apple Computer Buses page.
A full list of buses found on any computer type is listed on the Personal Computer Buses page.
Any other style of electrical interface may be found by using the 'Buses' icon at the bottom of the page.
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The slash before each of the signal names indicate that the line is active low.
This pinout table provides the signal assignments for a data bus that is over 25 years old.
The electrical interface went obsolete after the PCI bus was released in 1991.
So unless your debugging a 20 year old computer, this data should not be used.
FYI; The terms Signal Assignments, Pinout, and Pin Out all mean the same thing.
They each define which bus signal resides on which pin in the interface, and the terms are interchangeable.
Nubus was also released by TI in 1983, before it became an IEEE standard. The two interfaces are not the same.
Nubus is obsolete and should not be used for new designs, use the PCIe Interface as an upgrade path.
There are no companies that have been identified that produce components or ICs for the NuBus interface, because the bus is out-dated. However this site does include a generic listing of component manufacturers, as; Component and Semiconductor Manufacturers [alphabetic listing].
NuBus is an Out-dated, legacy interface for peripherals and other printer interfaces.
However judging by the page views or searches, interest in this Obsolete interface has faded.
Apple has moved on to the same buses and standard interfaces found in normal PCs, once called IBM compatible machines.
This expansion bus went obsolete over 20 years ago, and should no longer be used.
The data remains for informational reasons only and provides no value to modern expansion board design.
Although a Legacy system may still use the Interface Bus.
The NuBus is Obsolete and should not be used with new system designs, use the PCIe Interface as an upgrade path. Additional PC Buses for reference.
Do not reference this bus in new designs, the NuBus interface is Antiquated and has been obsolete for a number of years now. However, in it's day, NuBus was considered a fast interface bus. The NuBus interface is obsolete and should not be used in up-coming designs.
Apple Computer no longer supports the NuBus interface.
Pinout tables for other Apple protocols are listed here; Apple Computer Buses.
Topic Navigation: Engineering Home > Interface Buses > Personal Computer Buses > Apple Computer Buses > NUBus.
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