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• Table of Contents
• Descriptions
• Architecture
  • Overview
  • Block diagram
  • Instructions list
• Software
• List of files and folders

A 4- or 8-bit CPU made with 74-series logic ICs.

HC4 has an 8-bit wide address bus and a 4-bit wide data bus. All of instructions are 8-bit wide.

Please refer to here.

The assembler for this CPU can be found here. Please see the documents for syntax and other details.

.
├─extra
├─hc4_asm
│  └─src
│      └─debug_data
├─HC4_KiCad
│  ├─HC4_gbr
│  ├─Library.pretty
│  └─sim
├─HC4_KiCad_EE
|  ├─production
│  ├─HC4_KiCad_EE-backups
│  └─Library.pretty
├─HC_MemoryBoard
│  ├─production
│  └─ThroughHole.pretty
└─verilog
    ├─HC4
    └─HC8

• README.md : This file.
• UsersManual_Software.md : Instruction manual.
• hc4_asm/ : [DEPRECATED] : Use new assembler. An assembler for the HC4 CPU.
• HC4_KiCad : Schematics and a board of the HC4.
• HC4_KiCad_EE : Schematics and a board of the HC4_E (Used to be called "HC4 Education Edition").
• HC_MemoryBoard : A schematic and a board for SRAM and I/O.
• verilog/
  • verilog/HC4 : Verilog simulation files of the HC4 CPU.
  • verilog/HC8 : Verilog simulation files of the HC8 CPU.
  • verilog/HC4e : Verilog simulation files of the HC4e CPU.