800gench3.fm Rev. A 800TCU User’s Guide 3-1
3
Theory of Operation
3.1 Introduction
The following pages describe the circuits on each of the circuit boards present in this unit.
The central board in the unit is the Processor Assembly. It contains the processor and the
front panel I/O logic. The descriptions of the remaining boards depend upon a prior
understanding of the processor board. TrueTime suggests reading the description of the
processor board first. References to the "MPU" refer to the processor on the Processor
Assembly unless otherwise specified.
3.2 Individual Circuit Board Descriptions
The following pages contain the circuit card descriptions. They are inserted in numerical
order.
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