The unprecedented scale of the pending merger of Chemical Banking Corp.  and Chase Manhattan Corp. would pose a systems consolidation challenge for   the combined retail bank.   
But before that consolidation could take place, the new Chase would have  to decide on a core retail processing system - a tough decision by most   accounts.   
  
Chemical and Chase have made relatively recent commitments to different  retail software packages, and industry experts are split on which is best   suited for the huge number of transactions that the resulting $300 billion-   asset institution would generate.     
Chase has used retail software from a number of vendors, a principal one  being Hogan Systems Inc. 
  
Chemical, after a lengthy review of retail platform options at the time  of its merger with Manufacturers Hanover Corp., opted for Hanover's system,   which was developed by Alltel Information Services Inc., formerly   Systematics Information Services.     
Some observers, including Lawrence A. Willis of First Manhattan  Consulting Group in New York, say they believe Alltel would be the best   retail solution, because it already has been through a large-scale   consolidation effort.     
"Given the size of Chemical's operations, the stability of the platform,  and the experience the bank has with the system, the probability is high   that they would choose this platform," said Mr. Willis, an executive vice   president at First Manhattan.     
  
He added that the Alltel system proved through the Chemical-Hanover  merger that it could handle a significant rise in transaction volume. 
This suggests that the system would be able to adapt to the increased  workload of the Chase-Chemical merger. 
However, Chemical did experience some trouble with Alltel's core  application software when it absorbed Hanover's branches in 1993. 
Internal documents from Chemical indicated that glitches in the software  were at least partially responsible for a rash of system outages at the   branches and at the bank's automated teller machines.   
  
Some say these problems - which have since been fixed - raise questions  about whether the software could handle an even bigger load of   transactions.   
But Mr. Willis said there was "nothing unusual" about the assorted  computer outages Chemical suffered that year. Such mishaps are to be   expected during large systems conversions, he said.   
Ken Mathis, a partner and financial services consultant with Coopers &  Lybrand, agreed that Alltel, which is based in Little Rock, has "an inside   track" because of Chemical's familiarity with it.   
He pointed out that a decision to use Alltel might make it easier for  the banks to realize some of the $1.5 billion a year in savings they hope   the merger will achieve by 1999.   
By using a familiar retail delivery system, the banks would be able to  cut costs more quickly, he said. 
"Since Chemical is comfortable with the Systematics system, why not run  with it and take some costs out early?" 
But William Bradway, a technology analyst with Wellesley, Mass.-based  Tower Group, said he believes both the Alltel and Hogan systems are strong   contenders. He said it is too early to divine a winner.   
Mr. Bradway pointed out that Chemical is faced with a different type of  decision than the one it made during the Hanover merger. 
At that time, Chemical was essentially comparing the Alltel system to  its proprietary system. "Now the bank is facing a choice between two strong   packages," Mr. Bradway said.   
He added that Hogan has a stronger presence among the top 25 U.S. banks.
Though split on the subject of core software, the analysts agreed that  the standardization of the applications surrounding the core processing   would be problematic.   
For example, many technology decisions lie ahead in such retail areas as  credit cards and mortgages, which are national businesses in both banks. 
In addition, the banks would probably likely face a quandary in the  check processing area. 
Both have begun migrating to check imaging systems, which streamline  operations by replacing paper checks with digitized pictures that can be   processed more quickly.   
However, they have committed to different hardware vendors - Chase to  Unisys Corp. and Chemical to International Business Machines Corp. - which   can complicate an already tough decision.   
It is unclear whether a merged bank would be able to extricate itself  from the financial commitments involved in the image processing systems.   Chase earlier this year inked a $460 million outsourcing deal for check   processing with Fiserv Inc., and Chemical just last month purchased a $50   million dollar in-house system from IBM.       
Chase has also announced significant investments in so-called middleware  technology that gives call-center representatives access to core   applications to support customer inquiries. It is unclear how much of this   would be carried over to the Chemical side, analysts said.