A friend has an ASR-10, but does not have the digital Input/Output capabilities. I believe this card was designated as the DI-10 and was available at some point from ensoniq. Im not sure if it was ever sold as an individual item/upgrade, or if it was only offered as a component on new ASR-10's.
Am I limited only to this DI-10 for digi I/O, or are there other cards that I can use or build?? If I have to use only a DI-10, where in the he** can one be found, short of already inside of an ASR-10??

Please advise!