IBM System/34 Maintenance Manual page 173

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CONTROL PROCESSOR
The control processor is made up of eight cards (16K
words of storage positions that can be addressed). Six
cards are for the control processor logic and two 16K
byte cards are for the control storage. The control
processor does the following:
• Aids in controlling system input/output operations
• Moves data between the input/output devices and
the main storage processor
• Handles some of the system control programming
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