You may have downloaded the dreamcast emulator and you may have read the help files but how do you really save games?
I started using chankast and I had no idea how I could possibly save a game in this, until I had used it several times and found out how to save games, its very simple once you actually know how.
First you open up chankast, please make sure you have no game image in your daemon tools or choice of virtual drive, we need chankast to be game free, click start, the emulator will start and take you to the dreamcast inbuilt section.
Select the VMU (memory card) option and allow it to open the page, now select both of the memory card and open them one at a time and do this to both of them, first you tell it to delete all data and click ok and ok until it asks you to choose a image and then a colour once you have done that the memory card is ready to use!
Do this on both of the memory cards, this will allow chankast to open and use the fake memory cards! Simple as that, I hope this helps you guys out!