1- SCSI A500 sidecar (A590, GVP A500HD+) - SCSI*IDE adapter - IDE*CF adapter
2- IDE A500 sidecar (AlfaData and such) - IDE*CF adapter
Or,
3- SCSI A500 sidecar (A590, GVP A500HD+) - SCSI*CF Media reader/writer.
They're available for keyboards and samplers (so they work without needing custom drivers). They're a little rare, but
this site claims to be selling them...
