Service manual

8 161
Theory of Operation
DIGITAL CONTROL OPERATION
8. Theory of Operation
DIGITAL CONTROL OPERATION
The digital control functional group consists of the following assemblies:
• A1 CPU
• A30 Front Keyboard
• A32 I-BASIC Interface
• A34 I/O Connector
• A51 GSP
• A52 LCD
• A53 FDD
These assemblies combine to provide digital control for the 4294A. They provide math
processing functions, as well as communications between the 4294A and an external
controller and/or peripherals.
Figure 8-3 is a simplified block diagram of the digital control
functional group.