To turn on Assembler support for a CICS-enabled enterprise server:
    
    
      - On the Enterprise Servers Administration page, click 
        Edit in the row for the server for which you want to enable Assembler support.
      
- Select the 
        General tab and type the following in the 
        Configuration Information section:
        [ES-Environment]
ES_MFASM_SUPPORT=Y 
- Click 
        Apply and then 
        OK.