Dnc of old control systems

Hi
Can you help me and other friends;
Old controlers have little memory for program and all of them can not DNC.they connected to PC with rs242/422or... but can not running in DNC mode. Only send /receive part program and today we need to update controller or change it with New control . We need to make an universal or type of cardes to connect PC to controller and work in DNC mode. Help me to this work or if made same cardes we need thats. Synumerik system3,simens810 , anilam 1100, and another old controllers.
Thank you for help