CP/M Neo is an innovative operating system inspired by CP/M, designed for those interested in exploring the fundamentals of operating systems in a modern context. Built to function on RISC-V architecture, CP/M Neo offers a straightforward development environment that emphasizes simplicity and a return to core computing principles.

Key Features

• RISC-V Compatibility: Tailored specifically for RISC-V bare-metal platforms, ensuring efficient and effective use of resources.
• Sysgen Tool: The sysgen utility facilitates the creation and management of CP/M Neo disk images. It allows users to build the OS, create disk images, and manage applications with ease.

Quick Start

To get started with CP/M Neo, the toolchain includes riscv64-unknown-elf-gcc, make, and sh. The following commands will help in building the system:

make -C sysgen
./sysgen/build/sysgen new --disk-size=2048K --mem=64K --platform=vemu --march=rv32im

The output is directed to the sysgen/build/ directory, containing essential files such as:

• disk.img: The final disk image
• bootloader.bin: The boot image
• kernel.bin: The core kernel binary
• ccp.bin: The Console Command Processor binary
• Applications are also bundled for immediate use.

For cleanup after builds, use:

make -C sysgen clean

Console Command Processor (CCP)

CP/M Neo incorporates a Console Command Processor (CCP) that simplifies navigation and file manipulation. Users can switch between volumes, manage files, and execute programs using a familiar command syntax reminiscent of CP/M 2.2.

Architecture

The architecture of CP/M Neo ensures that user applications can operate independently of the host hardware, utilizing the Transient Program Area (TPA) to facilitate seamless operation.

Documentation

A comprehensive documentation library is available, including guides for users and developers:

• User Guide: Learn to build and run CP/M Neo.
• CCP Reference: Detailed insights into the Console Command Processor.
• Disk Format: Understand the layout of CP/M Neo disk images.
• Syscall Reference: Access complete syscall API and ABI specifications.
• Bundled Apps: Explore programs that come pre-installed.
• Developer Guide: Guidance on SDK usage and application development.

Embrace the foundational computing experience that CP/M Neo provides, ideal for both educational purposes and hands-on software development.