NuBus connector pinout

#Computer#Buses and Slots

NuBus is a 32-bit parallel computer bus, originally developed at MIT as a part of the NuMachine workstation project, and eventually used by Apple Computer and NeXT Computer.

UNKNOWN connector  at the cardAvailable on old Apple Macintosh computers and on NeXT computers. Standard: IEEE 1196 NuBus was a considerable step forward compared to other interfaces of the day. At the time most computer bus systems were 8-bit, as were the computers they plugged into. However NuBus decided on a 32-bit interface because it was clear the market was headed in this direction.

In addition, NuBus was agnostic about the processor itself. Most buses up to this point were basically the pins on the CPU run out onto the backplane, meaning that the cards had to conform to the signalling and data standards of the machine it was plugged into (being little endian for instance). NuBus made no such assumptions, which meant that a NuBus card could be plugged into any NuBus machine, as long as there was an appropriate device driver.

And in order to select the proper device driver, NuBus included an ID scheme that allowed the cards to identify themselves to the host computer during startup. This meant that the user didn"t have to configure the system, the bane of bus systems up to that point. For instance, with ISA the driver has to be configured not only for the card, but for the slot it is plugged into, any memory it needs, and the interrupts it uses. NuBUS required no such configuration, making it one of the first examples of plug-and-play architecture.

Row A

PinNameDescription
1-12 V-12 VDC
2-
3/SPV
4/SP
5/TM1
6/AD1Address/Data 1
7/AD3Address/Data 3
8/AD5Address/Data 5
9/AD7Address/Data 7
10/AD9Address/Data 9
11/AD11Address/Data 11
12/AD13Address/Data 13
13/AD15Address/Data 15
14/AD17Address/Data 17
15/AD19Address/Data 19
16/AD21Address/Data 21
17/AD23Address/Data 23
18/AD25Address/Data 25
19/AD27Address/Data 27
20/AD29Address/Data 29
21/AD31Address/Data 31
22GNDGround
23GNDGround
24/ARB1
25/ARB3
26/ID1
27/ID3
28/ACK
29+5 V+5 VDC
30/RQST
31/NMRQ
32+12 V+12 VDC

Row B

PinNameDescription
1-12 V-12 VDC
2GNDGround
3GNDGround
4+5 V+5 VDC
5+5 V+5 VDC
6+5 V+5 VDC
7+5 V+5 VDC
8*Reserved ?
9*Reserved ?
10*Reserved ?
11*Reserved ?
12GNDGround
13GNDGround
14GNDGround
15GNDGround
16GNDGround
17GNDGround
18GNDGround
19GNDGround
20GNDGround
21GNDGround
22GNDGround
23GNDGround
24**Reserved ?
25**Reserved ?
26**Reserved ?
27**Reserved ?
28+5 V+5 VDC
29+5 V+5 VDC
30GNDGround
31GNDGround
32+12 V

Row C

PinNameDescription
1/RESETReset
2-
3+5 V+5 VDC
4+5 V+5 VDC
5/TM0
6/AD0Address/Data 0
7/AD2Address/Data 2
8/AD4Address/Data 4
9/AD6Address/Data 6
10/AD8Address/Data 8
11/AD10Address/Data 10
12/AD12Address/Data 12
13/AD14Address/Data 14
14/AD16Address/Data 16
15/AD18Address/Data 18
16/AD20Address/Data 20
17/AD22Address/Data 22
18/AD24Address/Data 24
19/AD26Address/Data 26
20/AD28Address/Data 28
21/AD30Address/Data 30
22GNDGround
23/PFW
24/ARB0
25/ARB2
26/ID0
27/ID2
28/START
29+5 V+5 VDC
30+5 V+5 VDC
31GNDGround
32/CLKClock

NuBus 90 connector pinout

PC Card ATA connector pinout