# Legacy

- [VEX Cortex](/vex-electronics/legacy/vex-cortex.md): The VEX Cortex is the older microcontroller that was used in VRC and VEXU
- [Power Expander](/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](/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](/vex-electronics/legacy/legacy-wiring-guide.md): This guide provides general wiring tips for the legacy cortex system.