Unibus

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Available on the old Digital PDP-11. The Unibus signals described in the PDP-11 bus handbook on the A and B connectors are used only for “Modified Unibus Devices” such as bus extenders, terminators and repeaters. Notably the type “2” signals only appear on one pin each. This is O.K on the A and B connectors because each bus segment has a bus in connector at one end and a bus out at the other and the type “2” signals are broken up when they run through the C,D,E and F connectors. Unibus boards that use the C,D,E, and F connectors are called “Small Peripheral Controllers”. Hex boards plug into the A and B connectors as well but do not pick up any signals from them (including power or ground.)

A, B connectors pinouts

     +------------//--------+   +------------//--------+ 
     |AA1 AB1 AC1 // AU1 AV1|   |BA1 BB1 BC1 // BU1 BV1| 
     |AA2 AB2 AC2 // AU2 AV2|   |BA2 BB2 BC2 // BU2 BV2| 
     +------------//--------+   +------------//--------+ 

2 x 36 EDGE FEMALE at the backplane

2 x 36 EDGE MALE at the cards/modules

AA1 /INIT BA1 BG6
AA2 POWER(+5v) BA2 POWER(+5v)
AB1 /INTR BB1 BG5
AB2 GROUND BB2 GROUND
AC1 /D00 BC1 /BR5
AC2 GROUND BC2 GROUND
AD1 /D02 BD1 GROUND
AD2 /D01 BD2 /BR4
AE1 /D04 BE1 GROUND
AE2 /D03 BE2 BG4
AF1 /D06 BF1 /ACLO
AF2 /D05 BF2 /DCLO
AH1 /D08 BH1 /A01
AH2 /D07 BH2 /A00
AJ1 /D10 BJ1 /A03
AJ2 /D09 BJ2 /A02
AK1 /D12 BK1 /A05
AK2 /D11 BK2 /A04
AL1 /D14 BL1 /A07
AL2 /D13 BL2 /A06
AM1 /PA BM1 /A09
AM2 /D15 BM2 /A08
AN1 GROUND BN1 /A11
AN2 /PB BN2 /A10
AP1 GROUND BP1 /A13
AP2 /BBSY BP2 /A12
AR1 GROUND BR1 /A15
AR2 /SACK BR2 /A14
AS1 GROUND BS1 /A17
AS2 /NPR BS2 /A16
AT1 GROUND BT1 GROUND
AT2 /BR7 BT2 /C1
AU1 NPG BU1 /SSYN
AU2 /BR6 BU2 /CO
AV1 BG7 BV1 /MSYN
AV2 GROUND BV2 GROUND

C, D, E and F connectors pinouts

Unknow connector

PIN SIGNAL PIN SIGNAL
A00 L EH2 CO L EJ2
A01 L EH1 C1 L EF2
A02 L EF1 MSYN L EE1
A03 L EV2 SSYN L EJ1 FC1
A04 L EU2 PA L CC1
A05 L EV1 PB L CS1
A06 L EU1 INTR L FM1
A07 L EP2 BR4 L DH2
A08 L EN2 BR5 L DF2
A09 L ER1 BR6 L DE2
A10 L EP1 BR7 L DD2
A11 L EL1 BG4I H DS2
A12 L EC1 BG4O H DT2
A13 L EK2 BG5I H DP2
A14 L EK1 BG5O H DR2
A15 L ED2 BG6I H DM2
A16 L EE2 BG6O H DN2
A17 L ED1 BG7I H DK2
D00 L CS2 BG7O H DL2
D01 L CR2 NPR L FJ1
D02 L CU2 FE2 NPGI H CA1 (N.B. CA1 wire-wrapped
D03 L CT2 FL1 NPGO H CB1 to CB1 on backplane.)
D04 L CN2 FN2 SACK L FT2
D05 L CP2 FF1 BBSY L FD1
D06 L CV2 FF2 INIT L DL1
D07 L CM2 FH1 ACLO L CV1
D08 L CL2 FK1 DCLO L CN1
D09 L CK2 +5V CA2 DA2 EA2 FA2
D10 L CJ2 GND CC2 CT1 DC2 DT1
D11 L CH1 EC2 ET1 FC2 FT1

References

Category:Buses Connectors

 

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