Bank One Corp. made a big stride last weekend in its efforts to unify its computer systems with those of the former First Chicago NBD Corp.

The old Banc One part of the company finished linking its general ledger systems to a new core accounting system from SAP America Inc., the U.S. arm of the German software vendor SAP AG. That blended the accounting systems of the former Banc One Corp. with those of the old First Chicago, with which it merged in October to form the fifth-largest U.S. bank holding company.

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