The Makerbase MKS DLC V2.1 is an offline, GRBL-based master control board designed for DIY laser and CNC machines, supporting 12V-24V power and external drivers. Essential documentation, including schematics and wiring manuals, can be found in the Makerbase MKS-DLC GitHub Repository for the 8-bit version or the MKS-DLC32 GitHub Repository for the ESP32 version. MKS DLC32 motherboard kit, which is an offline ... - GitHub
For additional files (pinout, firmware, schematics): makerbase mks dlc v21 manual link