If you look on ebay, and out in the search "Janome ATA" you should find some on there. I have a ATA adapter card that I bought from ebay, and I use a Compact Flash Memory card with it. I then have a 6 in 1 card adaptor that fits into my usb on my computer that I place the CF card into to transfer my designs from the computer to tha machine. Sounds complicated but really its not.
They are very cheap on Ebay.