> For the complete documentation index, see [llms.txt](https://wiki.purduesigbots.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.purduesigbots.com/vex-electronics/legacy.md). # Legacy - [VEX Cortex](https://wiki.purduesigbots.com/vex-electronics/legacy/vex-cortex.md): The VEX Cortex is the older microcontroller that was used in VRC and VEXU - [Power Expander](https://wiki.purduesigbots.com/vex-electronics/legacy/power-expander.md): A VEX Power Expander is a device which allows up to four of the VEX Motors on a robot to run from a second VEX Battery while still under the control of the VEX Cortex or VEX PIC. - [VEX Motor Controller](https://wiki.purduesigbots.com/vex-electronics/legacy/motor-controller.md): The VEX Motor Controller is a device which converts a standard logic-level PWM servo control signal into motive power to drive a Motors. - [VEX Cortex Wiring Guide](https://wiki.purduesigbots.com/vex-electronics/legacy/legacy-wiring-guide.md): This guide provides general wiring tips for the legacy cortex system. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://wiki.purduesigbots.com/vex-electronics/legacy.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.