This is a replacement dongle for the DECO cassette system. It consists of a new bios and the dongle. The bios loads the cassette data from eproms on the dongle instead of a cassette deck. This means the games have to be patched to run w/o a dongle. For some games it's a one byte patch for others it's a lot more. It's going to require a lot of testing before it's released to make sure all the protection has been patched out.
