There was discussion about the Chicken Systems sample converter doing the A3000-5000 format, but I'm sure it ever did or if the company is still out there. They also got some pretty mixed reviews.
Mostly, you are probably out of luck - its a shame, the A-series were nice samplers. If I remember right, the actual samples are in WAV or maybe AIFF format, and it used a non-prorietary disk system, so you should be able to plug the disk drive or CDROM into a computer and recover the actual samples (but not of course the mapping and filter or other programming)