No the Nintendo DS does not have a memory card. The game cartridges contain the saved file information on them. Therefore, you cannot play your file of a game on somebody else's game cartridge.
The N64 itself does not have a memory card, it contains a memory pak or if upgraded an expansion pak. These two allow the system to run properly and enhance graphics. However a memory card is required for some games to save data from file you have started. Memory cards can be inserted into the controller and used from there.
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Saved game data on DS games is always stored on the cartridge itself, no memory card is needed, and in fact the regular DS and the lite don't even have a slot for it. Any user settings like the date, time, etc, are stored on internal memory.
The DSi and the XL have a memory card slot, but this is for photographs and music only, pretty much. Even games from the DSi store use the console's internal storage space rather than the memory card.
Cartridge-based games will save to the cartridge. A memory card is necessary only if you download DSi-ware games from the shop.
It doesn't 'need' a memory card (Memory Stick is a Sony card, the DSi uses SD cards), you can play games without using one. A memory card would be for storing lots of photographs, MP3s or DSi store games.
You can only put the memory card into the computer if you have a camera. You put the memory card into the camera then using the camera cord, plug the camera into the computer then put the photos onto the computer. Hopefully that was easy enough for you to understand.
That's not how the DSi works - for one, code can't be executed from the SD card anyway. What you need to do is connect the DSi to the DSi store, and download the games there after you buy them.
Yes, the DSi has enough internal memory to store several DSiWare games at a time.
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You can put a memory card in, for music and photos. But it does not come with one, nor is one needed to play games.
The DSi XL does not need (and cannot have) a RAM upgrade. It has a small amount of internal storage space. If you want to take a lot of photographs, store MP3's or download DSi store games, you will also need an SD memory card for it.
You can download games/apps for the DSi via the DSi Shop.
You can download games/apps for the DSi via the DSi Shop.
as many as your ad card can hold
The DSi's memory card is only for photographs and music. It cannot run code, or run anything on the memory card, it completely lacks the ability to. It is for storage only.