Abstract
As a descendant of the 6800 microprocessor, the 6809 is the preferred teaching model in many UK educational establishments. The paper describes the design philosophy and implementation of a 6809 second processor for the BBC microcomputer which runs the Flex disc operating system. A silicon disc is implemented for Flex within the 256 kbyte array of dynamic RAM that comprises the 6809 memory. Only a single disc drive is required to use the system to its full extent, thereby providing a low cost, yet powerful, route for 6809 project development.
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