Even though MAXX STEELE was made by a toy company, MAXX was not Just a toy! MAXX had a lot of potential for Expansion. There were approximately 5000 MAXX STEELE's built by CBS Toys for IDEAL. One thing toy companies do a great job at is the way that they can make sophisticated machines in a simple and elegant manner. MAXX is an interesting example of what could be done with a Personal Robot. MAXX also had an Expansion port on his chest. The prototype cartridges contains a 2K ROM that runs MAXX through a demonstration. There is a Serial Port on Controller Expansion Interface Port on Maxx (in chest compartment)