Chemical Bank of New York, Coldata, and Cheyenne Software Inc have agreed joint marketing of a collection software package called Collexsys: Long Island-based computer service firm Cheyenne, is using its proprietary Cheyenne Application Engine, to modify and enhance the existing collection modules separately developed by Chemical Bank and Coldata for in-house use; the system will handle all collection needs and generate comprehensive managerial reports, and runs on an IBM Personal configuration costing under $5,000 rather than $40,000 or more for a mainframe environment.