High Quality Content by WIKIPEDIA articles! BBC Micro expansion units, for the BBC Microcomputer were peripherals in a box with the same profile and styling as the main computer. The Second Processors connected to Acorn's proprietary and trademarked Tube interface. Only one second processor could be connected at a time. The terminology of second processor was slightly misleading, since connected and switched on, the system worked on a "master-slave" model, with the processor in the external unit taking control while the 6502 in the "main" computer simply took on responsibility for I/O.

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