Diagnostic Panel (Optional); Set-Up Panel - Digital Equipment LB12 Field Support Manual

2.1.14

Diagnostic panel (optional)

2.1.15

Set-up panel

2-24
When numeric characters are to be displayed, the CPU transfers the character data to the
two BCD-to-7-segment decoders on the diagnostic panel via the DBUS and the DBBUS.
The CPU also generates the chip select signal CSDA-N by addressing the chip select
decoder U42 on the main board via the ABUS. The selected display segments are switched
ON by CSDGNS-N.
The status of all switches on the diagnostic panel, except the setting switch, are transferred
to the parallel interface/timer U3 on the main board, where they are retrieved by the CPU.
The status of the setting switch is available to the CPU via the DUART.
The set-up panel is the same as the diagnostic panel, except that the printed board
assembly has only a lid switch and a step switch. These switches function in the same way
as the corresponding switches on the diagnostic panel.
LB12/LB15 Field Support Manual
Figure 2-26 Diagnostic panel
(See Figure 2-27)
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