Ba 11-S Mounting Box; H9276 Backplane; H7861 Power Supply; H403-B Ac Input Box - Digital Equipment PDP-11/23-PLUS System Manual

SYSTEM COMPONENTS 73
Table 5-8 DZV11 (M7957) Factory Switch Setting
Number
Switch Position
Address Switch Selection (160100)
A3
10 OFF
A4
9
OFF
AS
a
OFF
A6 7 ON
A7
6 OFF
A8 5 OFF
A9
4
OFF
A10
3
OFF
A 11 2 OFF
A12 OFF
Vector Switch Selection (300)
V3 6 OFF
V4 5 OFF
V5
4
OFF
V6 3 ON
V7 2 ON
va
OFF
BA 11-S Mounting Box
The BA 11-8 mounting box houses a 70 cfm fan to cool the logic modules,
a 100 cfm fan to cool the power supply, an H9276 backplane with a card
frame assembly, an H7861 power supply, and an H403 ac input box. The
BA 11-8 is shown in Figure 5-7.
H9276 Backplane - The H9276 is a 9 X 4 backplane consisting of nine
slots with four rows each (Figure 5-8). Both double and quad-modules can
be inserted. Rows A and B of each slot supply the extended L81-11 bus
signals, which are bussed to each of the nine rows. The pins of the C and
o
rows are connected to the pins of adjacent rows. The factory con-
figuration of jumpers on the backplane is shown in Figure 5-8.
H7861 Power Supply· - The H7861 power supply contains three circuit
boards that supply
+
12 Vac and
+
5 Vdc to the backplane.
H403-B AC Input Box· - The H403-B ac input box receives the ac input
power and distributes it to the power supply and the fans. The input box
provides a fused input and a switch used to adapt for either 120 Vac or
240 Vac. This switch is located on the rear of the 11/ 23B processor
shown in Figure 3-6 .
• More detailed information is contained in the PDp· 11/ 23B Mounting Box Technical Man-
ual.