
also forgot to post this to help you get the rom started.
Also there is a way to tell sometimes the roms comes with a text file and if you read it it has something like this + -[USA-NDS]-------------[128MBit]- this tell me it's 64 because 64x2=128rom size
also your game Dawn of Sorrow will uses a 256 the rom size is 512 256x2=512 I will like to Add not all games work that way but you can figure out most like this.
also the newest one has an auto feature