# Unibus

Available on the old Digital PDP-11.

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

(at the computer)

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

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

Contributor: Rob Gill

Source:
Digital PDP-11 peripherals handbook

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07