AT&T 3B2/300 Technical Reference Manual page 343

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - -
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MAIN CONTROLLER
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FETCH CONTROLLER
EXECUTE CONTROLLER
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CONTROL BUSES
Figure 3-28: CM518B/C System Board CPU - Functional Block Diagram
3-90 TECHNICAL REFERENCE MANUAL