Other types of things are used to fool the main cpu unit on the machine to defeat security aspects of the software. So you need to fool the software into thinking your machine is complete with whatever the software is checking for. But say your basic machine doesn't have that upper display hardware but you want to run the game software anyway. Like if a game is developed for a machine that has an upper display that did some graphical animation to make the game more fun, more robust in the casino. It is a way to run some game software that was written to check for the presence of certain hardware that your machine does not have. I think a 'fooler board' is a board that attaches by a cable to the main cpu unit in the machine to make it think there is another circuit board or assembly in the machine that isn't actually there. But later they may come out with a new game that has a lot more features like lots of sound effects, songs, etc so the software gets larger and then they have to use a cf card that has a larger size to hold all of it. If the software is 200 megabyte in size there's no need to use a 512 mb cf card since a 256 mb cf card will work just fine. When the slot machine company uses a cf card in their machine they select one with a size that is big enough to hold the software that is stored on it. Computer related technology changes and improves all the time and that includes memory storage devices. Also, as time goes by the little memory chips inside the cf card were improved and were able to hold larger amounts of information, so cf card companies were able to make them that hold more than they could years earlier but at the same or lower cost. So they don't overbuild all of them, some have less memory storage because that is enough storage for some things and it keeps the cost lower. So the more of the memory chips you have then the larger amount of information the cf card can hold, but that makes the cf card a higher cost to build.

There are actually little memory chips inside, and they cost something. They come in different sizes depending on how much information needs to be stored on them.

They were used in cameras, computers and other things back in the day. Like small memory boards in a plastic housing to make it easier for people to install and remove. Compact Flash cards are just memory devices.

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