From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Reality Machine is a living, talking, giant rice cooker that generates things off of pictures that are placed into it. It was invented by Norimaki Senbei. Senbei was originally going to use it to generate a woman out of a dirty magazine, but while he was interrupted by the phone ringing, Arale and Akane put a picture of space and the manga page the scene was taking place on in it, instead causing trouble for Senbei.
In the Dr. Slump remake, Arale puts the last volume of the Dragon Ball manga into Reality Machine and a black and white version of Son Goku and Kid Boo come out of Reality Machine fighting each other.