The Rare Digital Research CP/M Plus User's Guide Programmer's Guide System Guide is a vintage computing document from Microsoft. This guide provides detailed information and instructions for users of the CP/M Plus operating system, offering valuable insights for programmers and system administrators looking to optimize the performance of their computer systems. With a focus on the unique features and capabilities of the CP/M Plus platform, this guide serves as a valuable resource for those interested in exploring the history and development of vintage computing technology.