I'm starting the pre-order list for the Dragonfly SD cartridge.
Technical Specifications
Dragonfly supports .a78 files (with header) in sizes 4k, 8k, 16k, 32k, 48k without banking and 64k, 128k, 144k, 256k, 272k , 512k, 528k , 1024k with banking, up to 16kB RAM at address $4000 and POKEY at $4000 and $0450 addresses. Also supports Absolute and Activision. In developer mode, you can also upload .bin files.
With the Pokey Max chip it