CNC Lathe Help

[HokeCNCwanabe]

Hi Everybody. I'm new to this game. I've got an EMCO Compact 5 CNC Lathe with a bunch of "G" Code programs that I must hand enter. I would like to find software that I can load on a laptop and write, save and upload programs to the lathe. The EMCO Compact 5 has a 25 pin serial port on the back and I have a USB to 25 pin cable. Any suggestions would be very much appreciated.