NCR Corp., through an agreement with the PBGC, will continue to fulfill minimum pension funding requirements without dipping into its credit balance. NCR, a Dayton, Ohio-based computer company, had in the past contributed to its pension plan more than what was required by law, accumulating more than $100 million in a credit balance, the PBGC reported. The agreement stipulates NCR will keep making its minimum funding contribution, but can't dip into its $100 million credit. NCR also will put up $80 million of its real estate investments to guarantee future funding of the plan. An agency spokeswoman would not be exact, but said NCR's underfunding - on a PBGC termination basis - is at least $80 million.