NuBus

Available on old Apple Macintosh computers and on NeXT computers.
Standard: IEEE 1196, "Nubus-A simple 32-bit backplane bus".
Texas Instruments owns the standard today.

UNKNOWN CONNECTOR (at the card)
(at the computer)

UNKNOWN CONNECTOR at the card.
UNKNOWN CONNECTOR at the computer.

Row A

Pin	Name	Description
1	-12 V	-12 VDC
2	-
3	/SPV
4	/SP
5	/TM1
6	/AD1	Address/Data 1
7	/AD3	Address/Data 3
8	/AD5	Address/Data 5
9	/AD7	Address/Data 7
10	/AD9	Address/Data 9
11	/AD11	Address/Data 11
12	/AD13	Address/Data 13
13	/AD15	Address/Data 15
14	/AD17	Address/Data 17
15	/AD19	Address/Data 19
16	/AD21	Address/Data 21
17	/AD23	Address/Data 23
18	/AD25	Address/Data 25
19	/AD27	Address/Data 27
20	/AD29	Address/Data 29
21	/AD31	Address/Data 31
22	GND	Ground
23	GND	Ground
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

Pin	Name	Description
1	-12 V	-12 VDC
2	GND	Ground
3	GND	Ground
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 ?
12	GND	Ground
13	GND	Ground
14	GND	Ground
15	GND	Ground
16	GND	Ground
17	GND	Ground
18	GND	Ground
19	GND	Ground
20	GND	Ground
21	GND	Ground
22	GND	Ground
23	GND	Ground
24	**	Reserved ?
25	**	Reserved ?
26	**	Reserved ?
27	**	Reserved ?
28	+5 V	+5 VDC
29	+5 V	+5 VDC
30	GND	Ground
31	GND	Ground
32	+12 V

Row C

Pin	Name	Description
1	/RESET	Reset
2	-
3	+5 V	+5 VDC
4	+5 V	+5 VDC
5	/TM0
6	/AD0	Address/Data 0
7	/AD2	Address/Data 2
8	/AD4	Address/Data 4
9	/AD6	Address/Data 6
10	/AD8	Address/Data 8
11	/AD10	Address/Data 10
12	/AD12	Address/Data 12
13	/AD14	Address/Data 14
14	/AD16	Address/Data 16
15	/AD18	Address/Data 18
16	/AD20	Address/Data 20
17	/AD22	Address/Data 22
18	/AD24	Address/Data 24
19	/AD26	Address/Data 26
20	/AD28	Address/Data 28
21	/AD30	Address/Data 30
22	GND	Ground
23	/PFW
24	/ARB0
25	/ARB2
26	/ID0
27	/ID2
28	/START
29	+5 V	+5 VDC
30	+5 V	+5 VDC
31	GND	Ground
32	/CLK	Clock

+5V

Power to slot; 2 amps per slot maximum continuous.

+12V

Power to slot; 0.25 amps per slot maximum continuous.

-12V

Power to slot; 0.1 amps per slot maximum continuous.

-5.2V

Unused

GND

Power return for +5V, +12V, and -12V

RESET

Open collector signal; card should use to reset circuitry.

SPV

Slot Parity Valid; asserted if card provides parity. Never asserted under Apple NuBus.

SP

Slot Parity; odd parity of AD0-AD3 if SPV asserted.

TM0 - TM1

Transaction modifiers.

AD<31:0>

Address/Data bits 31 to 0.

PFW

Power Fail Warning given 2ms before AC power is lost.

ARB<3:0>

Arbitration bits 3 to 0; arbitrates system mastership.

ID<3:0>

Geographical address 3 to 0; hard-coded to slot.

START

Asserted to indicate an address on AD lines.

ACK

Acknowledge of START cycle.

RQST

Request; asserted to request bus mastership.

NMRQ

Non-master request; used to signal an interrupt.

CLK

Clock. Asymmetrical 10MHz clock; synchronous transactions on NuBus.

Contributor:

Joakim Ögren, Karsten Wenke, Michael Van den Acker, Godel?

Source:

Apple Tech Info Library 2194: Macintosh II NuBus Slots, Pinout at Apple TIL homepage