NuBus
From HwB
NuBus 87
Available on old Apple Macintosh computers and on NeXT computers.
Texas Instruments owns the standard today.
Replaced by NuBus 90
Contents |
Pinout
96 PIN DIN 41612/IEC 60603-2 MALE at the cards.
96 PIN DIN 41612/IEC 60603-2 FEMALE 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.
Standards
- IEEE 1196, "Nubus-A simple 32-bit backplane bus".