The Sega Dreamcast is a console that I don't have a lot of experience with. I remember purchasing one at a local game store when I was in High School, and since then, I haven't really played it that much.
I only have a few games for it like Crazy Taxi and Soul Calibur, and a lot of the highly sought after games like Shenmue, Jet Grind Radio, Phantasy Star Online, or literally any Sonic release go for crazy amounts on the collector's market.
Save game data is stored on Visual Memory Units or VMUs, which are memory cards with screens. I remember buying one on eBay and unboxing it for a video. The main purpose of the VMU's screen is to let the user browse save data while the console is turned off, as well as show information to the player while the VMU is plugged into the controller. It was an interesting device to mess around with and hope to utilize it to it's fullest potential sometime in the future.
Apart from games, the Dreamcast seems to have a few hardware quirks going on with it too. The Dreamcast has this issue where if you unplug a controller from a port while the console is turned on, it will apparently break and short out the port (at least according to the dude that sold it too me). Also, the clock battery is a pain to replace because of course it is. I hope you brought your soldering iron and an after-market replacement part, because simply unscrewing the damn thing and replacing a CR2032 battery would be just too easy! Personally, I just reset the clock everytime on boot-up. It's much easier.
Overall, the Dreamcast is an odd one. It's a console I don't have a lot of games for, a console with a ton of hardware quirks, and a console that has what is quite possibly the most interesting memory card I've ever used.
