UNIBUS H854 header pinout

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DEC produced several boards (the M9014, an extended height dual card, and the M9042 short dual card) cards to replace the standard BC11A UNIBUS cable. They plug into the same 'UNIBUS In' and 'UNIBUS Out' backplane slots as the BC11A, and contain three 2x20 headers for 40-conductor flat cables (known as H854 cables in DEC parlance); a pair of these cards, and three cables, perform the same role as a BC11A cable.

Both of these cards use the header pinout given below, so they may be used interchangeably. Following standard electrical engineering practise, every alternate wire in the flat cable is a ground: the active pins are B, D, F, J, L, N, R, T, V, X, Z, BB, DD, FF, JJ, LL, NN, RR, TT, VV (using the Berg header pin nomenclature).

By class

Signal Assertion Termination BC11A pin Berg header pin
Initialization and Shutdown
DC LO L Slow BF2 J3-VV
AC LO L Slow BF1 J2-VV
INIT L Fast AA1 J3-Z
Arbitration
NPR L Fast AS2 J3-B
BR7 L Fast AT2 J3-F
BR6 L Fast AU2 J3-L
BR5 L Fast BC1 J3-R
BR4 L Fast BD2 J3-V
NPG H Grant AU1 J3-D
BG7 H Grant AV1 J3-J
BG6 H Grant BA1 J3-N
BG5 H Grant BB1 J3-T
BG4 H Grant BE2 J3-X
SACK L Fast AR2 J3-TT
Address
A00 L Fast BH2 J1-D
A01 L Fast BH1 J1-B
A02 L Fast BJ2 J1-J
A03 L Fast BJ1 J1-F
A04 L Fast BK2 J1-N
A05 L Fast BK1 J1-L
A06 L Fast BL2 J1-T
A07 L Fast BL1 J1-R
A08 L Fast BM2 J1-X
A09 L Fast BM1 J1-V
A10 L Fast BN2 J1-BB
A11 L Fast BN1 J1-Z
A12 L Fast BP2 J1-FF
A13 L Fast BP1 J1-DD
A14 L Fast BR2 J1-LL
A15 L Fast BR1 J1-JJ
A16 L Fast BS2 J1-RR
A17 L Fast BS1 J1-NN
Data
D00 L Fast AC1 J2-B
D01 L Fast AD2 J2-F
D02 L Fast AD1 J2-D
D03 L Fast AE2 J2-L
D04 L Fast AE1 J2-J
D05 L Fast AF2 J2-R
D06 L Fast AF1 J2-N
D07 L Fast AH2 J2-Z
D08 L Fast AH1 J2-T
D09 L Fast AJ2 J2-Z
D10 L Fast AJ1 J2-X
D11 L Fast AK2 J2-DD
D12 L Fast AK1 J2-BB
D13 L Fast AL2 J2-JJ
D14 L Fast AL1 J2-FF
D15 L Fast AM2 J2-NN
Control
C0 L Fast BU2 J3-NN
C1 L Fast BT2 J1-TT
PA L Fast AM1 J2-LL
PB L Fast AN2 J2-RR
BBSY L Fast AP2 J3-BB
MSYN L Fast BV1 J3-LL
INTR L Fast AB1 J3-FF
SSYN L Fast BU1 J3-JJ
Power
Ground N/A N/A AB2
Ground N/A N/A AC2
Ground N/A N/A AN1
Ground N/A N/A AP1
Ground N/A N/A AR1
Ground N/A N/A AS1
Ground N/A N/A AT1
Ground N/A N/A AV2
Ground N/A N/A BB2
Ground N/A N/A BC2
Ground N/A N/A BD1
Ground N/A N/A BE1
Ground N/A N/A BT1
Ground N/A N/A BV2
Ground N/A N/A N/A J1-VV
Ground N/A N/A N/A J2-TT
Ground N/A N/A N/A J3-DD
Ground N/A N/A N/A J3-RR
+5 N/A N/A AA2
+5 N/A N/A BA2
Other
No connection N/A N/A BA2
No connection N/A N/A BB2

By Berg pin

Signal Assertion Termination BC11A pin Berg header pin
Header J1
A01 L Fast BH1 J1-B
A00 L Fast BH2 J1-D
A03 L Fast BJ1 J1-F
A02 L Fast BJ2 J1-J
A05 L Fast BK1 J1-L
A04 L Fast BK2 J1-N
A07 L Fast BL1 J1-R
A06 L Fast BL2 J1-T
A09 L Fast BM1 J1-V
A08 L Fast BM2 J1-X
A11 L Fast BN1 J1-Z
A10 L Fast BN2 J1-BB
A13 L Fast BP1 J1-DD
A12 L Fast BP2 J1-FF
A15 L Fast BR1 J1-JJ
A14 L Fast BR2 J1-LL
A17 L Fast BS1 J1-NN
A16 L Fast BS2 J1-RR
C1 L Fast BT2 J1-TT
Ground N/A N/A N/A J1-VV
Header J2
D00 L Fast AC1 J2-B
D02 L Fast AD1 J2-D
D01 L Fast AD2 J2-F
D04 L Fast AE1 J2-J
D03 L Fast AE2 J2-L
D06 L Fast AF1 J2-N
D05 L Fast AF2 J2-R
D08 L Fast AH1 J2-T
D07 L Fast AH2 J2-V
D10 L Fast AJ1 J2-X
D09 L Fast AJ2 J2-Z
D12 L Fast AK1 J2-BB
D11 L Fast AK2 J2-DD
D14 L Fast AL1 J2-FF
D13 L Fast AL2 J2-JJ
PA L Fast AM1 J2-LL
D15 L Fast AM2 J2-NN
PB L Fast AN2 J2-RR
Ground N/A N/A N/A J2-TT
AC LO L Slow BF1 J2-VV
Header J3
NPR L Fast AS2 J3-B
NPG H Grant AU1 J3-D
BR7 L Fast AT2 J3-F
BG7 H Grant AV1 J3-J
BR6 L Fast AU2 J3-L
BG6 H Grant BA1 J3-N
BR5 L Fast BC1 J3-R
BG5 H Grant BB1 J3-T
BR4 L Fast BD2 J3-V
BG4 H Grant BE2 J3-X
INIT L Fast AA1 J3-Z
BBSY L Fast AP2 J3-BB
Ground N/A N/A N/A J3-DD
INTR L Fast AB1 J3-FF
SSYN L Fast BU1 J3-JJ
MSYN L Fast BV1 J3-LL
C0 L Fast BU2 J3-NN
Ground N/A N/A N/A J3-RR
SACK L Fast AR2 J3-TT
DC LO L Slow BF2 J3-VV