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 | | 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[UNKNOWN] (unknow connector) | PIN | SIGNAL | | PIN | SIGNAL |
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| 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 |
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