The present invention provides various modules for use with gaming machines. One such module is configured to receive data from a portable memory device and/or from a network device, e.g., from a game server. In some embodiments, the module includes, or is disposed within, a player tracking unit. Some embodiments of the module include a central processing unit (“CPU”) and a memory device such as a dual-ported random access memory (“DPRAM”). Data, such as software or content, may be downloaded to the module's CPU and written to the module's memory. According to some embodiments, data are written to a DPRAM in the module and simultaneously written from the DPRAM to the gaming machine via a high-speed digital bus. In some implementations, a memory in the module is configured to emulate a memory of the gaming machine. This allows a CPU of the gaming machine to execute software stored in the memory in the module. In alternative implementations, a CPU in the module can execute software stored in the memory in the module.