This is a converter that allows you to use various USB controllers on the Dreamcast console. It is a handmade product. For more details, search for "Dreamcast USB4MAPLE". As shown in the image, connecting an SD card via a USB hub allows you to use the SD card as a memory card. I have tested it with: Xbox 360 wired controller 8bitdo M30 2.4g (Recognized as an arcade stick, functions with 6 buttons) HORI Switch wired controller (LR triggers work) I have confirmed that saving works without any problems. I have multiple units in stock, so please let me know if you want more than one. The price on this page is for one unit. It's 1700 yen each. Thank you for viewing.