The biggest regional electronic banking networks reached record highs  in terms of transaction volume last year, mostly propelled by explosive   growth in point-of-sale debit cards.   
Here are the yearend results supplied by the top six networks:
  
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Star System Inc., San Diego, boosted its total transactions by 12% from  1993 to 1994. 
  
Its automated teller machine transaction growth was 7%.
Transactions through Explore, Star's point-of-sale debit card network,  climbed to 70 million, an increase of 27% from 1993. 
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The MAC network, owned and operated by Electronic Payment Services Inc.,  Wilmington, Del., said ATM transactions had increased by 9% and POS   transactions had increased by 93% between 1993 and 1994.   
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The NYCE network, owned and operated by Infinet Payment Services,  Hackensack, N.J., reported ATM transaction growth of 16% and POS   transaction growth of 67% from 1993 to 1994.   
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Combined ATM and POS transactions at Honor, the southeastern regional  owned and operated by Maitland, Fla.-based Southeast Switch Inc., grew by   20% from 1993 to 1994. ATM transactions grew by 21%, and POS transactions   grew by 78%.     
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Internet Inc., the Reston, Va.-based owner and operator of the Most  network, said 1994 transaction topped 1993 by 21%. ATM transaction growth   was 13%, and POS transaction growth was 110%.   
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The Pulse EFT Association, Houston, processed more than 135 million  transactions during 1994, up 20% from the previous year. 
The Houston-based network's POS service, Pulse Pay, grew to more than 20  million transactions in 1994, an increase of more than 48%.