The YCPU Specification

The YCPU Specification describes a virtual 16-bit processor with a comprehensive instruction set and features. The specification document is released to the public domain, and anyone may use it for any purpose without permission or attribution.

This repository also hosts software which assembles and disassembles YCPU programs, and emulates the YCPU platform. This software is written in C# and uses the XNA framework, and may be reused under the terms of the MIT license.

You can download a compiled version of the emulator from zanedubya.itch.io/ycpu.

Source Tree

• Documentation - Specifications describing the YCPU and auxiliary emulated hardware devices.
• Resources - Binary resource files that are used by the YCPU's auxiliary emulated hardware devices.
  • Import - contains raw resource files - a palette and charset for the LEM display device.
  • Export - contains binary resource files - 'compiled' versions of files from Import folder.
  • ResourceBuilder - C# program that builds the resource files.
• Source - Source code for the emulator, assembler, and disassembler.
  • Libraries - Class library that describes the YCPU, auxiliary hardware, emulator, assembler, and disassembler.
    • YpsilonAsm - Assembles YASM files into binaries.
    • YpsilonCPU - YCPU emulator.
    • YpsilonFramework - Common code for hosting YCPU emulation.
  • YCPUXNA - XNA platform for hosting YCPU emulator/assembler/disassember on the Win/.NET platform.
• Tests - Example ASM files that can be assembled by the Assembler.

Thanks To:

Tim "DensitY" Hancock (DCPU-16 ASM.NET, a C# DCPU emulator, included under the MIT License)
The NESDEV Community (help developing the specification)