The buffers link the microprocessor data bus with certain flexible disk drive control signals.
The flexible disk drive informs the microprocessor through the data bus whether a flexible
disk has been changed and whether the flexible disk drive is ready to read from or write to a
flexible disk. The microprocessor can also inform the flexible disk drive to format a flexible
disk with a high-density format.
Module Interface and Correlator
The Module Interface provides microprocessor access to the acquisition and stimulus option
modules that are plugged into the mainframe. The Correlator provides the means for
time-aligning module trace data on the mainframe display.
Theory of Operation
The Microprocessor Board
8–9
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