If your Yasnac 3000G has (or had) a tape reader, there is a solution with a software that emulates that reader, they sell it as a kit with special cable, software, instructions and all the support you could need to get started. Your machine has to be feeded with a special system, not pc serial and regular dnc as the newer ones.
There might be another options tough, but I can only speak for this company, I've emailed them in the past and always got good, nice answers.
Follow this link:
BTR Connections forolder Fanue CNC's