Show us a picture of the ends because chances are it's just a standard parallel port cable.? That doesn't mean you can use standard printer type cable because it could have dedicated pin arrangement to suit the board it connects to but you will be able to buy the ends and make your own cable and copy the pin arrangement of the old one.
If you check the old cable with a continuity meter and the pin layout matches the standard straight thru cables used on CNC machines then you'll be able to buy the cable made up.

Chances are thou Pacer will use Bespoke dedicated control boards with there own pin arrangment but you'll still be able to buy the ends to repair it.

Regards converting then we'd need to know more about what's inside the machine. Pictures of inside the control panel or control box will help along with pics of motors.