How many card slots does the Mainframe have?

The Mainframe of the TC Electronic System 6000 is designed with a total of four card slots. This configuration is significant because it allows for the flexibility of expanding the system's capabilities by installing various audio processing cards. Each slot can be populated with different types of cards, enabling users to tailor the system to their specific requirements, whether that be for effects processing, dynamic control, or other audio manipulation tasks. This modular approach is one of the defining features of the System 6000, contributing to its versatility and performance in professional audio environments.