Do you mean DYNA CNC? They used to manufacture CNC machines in San Jose CA: About DYNA You might be able to get some tech support on your old machine, if they made it.
If it still has a control system and motors, you might be able to get it to work with third-party control software, although the PlasmaCAM software wouldn't be what I'd recommend unless it's a plasma cutter, or all you were doing was cut-out work. LinuxCNC, Mach3/4, or UCCNC would be more generally useful. If you could get the pin-out for your machine, it would be easier than trying to figure it out by trial and error. Perhaps listing the particulars of your machine in a separate post and asking about the ports and pins for it, or finding someone out there who has a manual that covers your model would get you going again.
Failing that, you could get another control box and some software to run it; the motors you've got are probably still okay.