I am just trying to use Mach3 to communicate g-code to an old Bridgeport series 1 Cnc machine. I have no other way at this time to send g-code to machine. Is this possible? Any suggestions would be greatly appreciated. I have paid for full version of Mach3 so not limited to lines of code..  Thanks.

Afraid not, Mach is a trajectory planner and controller and takes the place of the original control on your machine.
You maybe should look into seeing if your control supports DNC, if it does then you can maybe hook it up via serial port to your computer and drip feed the code you have.
Hood

Good Idea, will be looking into that, Thanks