GDEMU is compatbile with VA1 model Dreamcasts from all regions
Supported memory cards:
SD: 512MB, 1GB, 2GB
SDHC: 4GB, 8GB, 16GB, 32GB
Supported filesystems:
FAT (also known as FAT16)
FAT32
Supported image types:
GDI for GD-ROMs
CDI for MIL-CDs and bootable homebrew apps
ISO (as data carriers for homebrew)