This comprehensive service manual provides detailed technical information for the CASIO DT-800/860IOE I/O BOX, manufactured in 1997. It offers a complete guide to understanding and repairing this electronic device. Inside, you'll find detailed instructions covering a wide range of topics including: * **Specifications:** Understanding the technical specifications of the DT-800/860IOE I/O BOX. * **Options:** A breakdown of available options and configurations for the device. * **Main Frame Configuration:** Detailed information on the internal structure and layout of the device. * **Memory Map:** A visual representation of the device's memory organization. * **Battery Change:** Step-by-step instructions on replacing the device's battery. * **Disassembly and Assembly:** Clear and precise instructions on how to disassemble and reassemble the device. * **Diagnostic Program:** Guidance on using diagnostic programs to troubleshoot issues. * **Circuit Diagram:** Detailed electrical diagrams for understanding the device's circuitry. * **Parts List:** A complete inventory of parts used in the DT-800/860IOE I/O BOX. * **Each Part Name and a Work:** Descriptions of each part and its respective function. * **Working Flow:** An overview of the device's operational workflow. This manual offers a complete resource for anyone seeking to maintain, repair, or troubleshoot the CASIO DT-800/860IOE I/O BOX.