Piedinature - Pinouts
Unibus

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Reference and Sources:
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| +------------//--------+   +------------//--------+

[UNKNOWN] (At the computer)

2 x 36 EDGE FEMALE at the backplane.
2 x 36 EDGE MALE at the cards/modules.

AA1/INIT BA1BG6
AA2POWER(+5v) BA2POWER(+5v)
AB1/INTR BB1BG5
AB2GROUND BB2GROUND
AC1/D00 BC1/BR5
AC2GROUND BC2GROUND
AD1/D02 BD1GROUND
AD2/D01 BD2/BR4
AE1/D04 BE1GROUND
AE2/D03 BE2BG4
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
AN1GROUND BN1/A11
AN2/PB BN2/A10
AP1GROUND BP1/A13
AP2/BBSY BP2/A12
AR1GROUND BR1/A15
AR2/SACK BR2/A14
AS1GROUND BS1/A17
AS2/NPR BS2/A16
AT1GROUND BT1GROUND
AT2/BR7 BT2/C1
AU1NPG BU1/SSYN
AU2/BR6 BU2/CO
AV1BG7 BV1/MSYN
AV2GROUND BV2GROUND

C, D, E and F connectors pinouts

[UNKNOWN] (unknow connector)

PINSIGNAL PINSIGNAL
A00 LEH2 CO LEJ2
A01 LEH1 C1 LEF2
A02 LEF1 MSYN LEE1
A03 LEV2 SSYN LEJ1 FC1
A04 LEU2 PA LCC1
A05 LEV1 PB L CS1
A06 LEU1 INTR LFM1
A07 LEP2 BR4 LDH2
A08 LEN2 BR5 LDF2
A09 LER1 BR6 LDE2
A10 LEP1 BR7 LDD2
A11 LEL1 BG4I HDS2
A12 LEC1 BG4O HDT2
A13 LEK2 BG5I HDP2
A14 LEK1 BG5O HDR2
A15 LED2 BG6I HDM2
A16 LEE2 BG6O HDN2
A17 LED1 BG7I HDK2
D00 LCS2 BG7O HDL2
D01 LCR2 NPR LFJ1
D02 LCU2 FE2 NPGI HCA1 (N.B. CA1 wire-wrapped
D03 LCT2 FL1 NPGO HCB1 to CB1 on backplane.)
D04 LCN2 FN2 SACK LFT2
D05 LCP2 FF1 BBSY LFD1
D06 LCV2 FF2 INIT LDL1
D07 LCM2 FH1 ACLO LCV1
D08 LCL2 FK1 DCLO LCN1
D09 LCK2 +5VCA2 DA2 EA2 FA2
D10 LCJ2 GNDCC2 CT1 DC2 DT1
D11 LCH1   EC2 ET1 FC2 FT1


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