Added documentation

Cargo.toml

@@ -2,6 +2,11 @@
 name = "rusty_emu"
 version = "0.1.0"
 edition = "2021"
+description = "A comprehensive Intel MCS-4 microprocessor simulator with JSON-configurable architecture"
+documentation = "https://docs.rs/rusty_emu"
+readme = "README.md"
+keywords = ["emulator", "intel", "mcs4", "4004", "microprocessor"]
+categories = ["emulation", "hardware-support", "simulation"]
 
 [dependencies]
 tempfile = "3.3.0"

README.md

@@ -1,16 +1,17 @@
 # Rusty Emulator
 
-A comprehensive Intel 4004/4001 microprocessor simulator written in Rust, featuring cycle-accurate emulation and
+A comprehensive Intel MCS-4 microprocessor simulator written in Rust, featuring JSON-configurable system architecture,
-extensive testing capabilities.
+cycle-accurate emulation, and extensive testing capabilities.
 
 ## Overview
 
 Rusty Emulator is a detailed simulation of Intel's first microprocessor system, the MCS-4 (Micro Computer System). It
 provides:
 
+- **JSON-Configurable Architecture**: Flexible system definition via JSON configuration files
 - **Hardware-Accurate Simulation**: Cycle-accurate timing where possible
 - **Comprehensive Testing**: Extensive test suite with multiple testing strategies
-- **Extensible Architecture**: Easy addition of new components and systems
+- **Extensible Design**: Easy addition of new components and system configurations
 - **Educational Value**: Clear implementation of microprocessor fundamentals
 
 ## Architecture
@@ -58,15 +59,22 @@ Intel 4003 Shift Register (10-bit serial I/O)
 rusty_emu/
 ├── src/                    # Source code
 │   ├── lib.rs             # Library exports
-│   ├── main.rs            # Binary entry point
+│   ├── main.rs            # Binary entry point with JSON configuration
 │   ├── component.rs       # Core component traits
 │   ├── pin.rs            # Pin and signal system
+│   ├── system_config.rs   # JSON-based system configuration system
 │   ├── components/        # Hardware components
 │   │   ├── common/       # Shared Intel 400x functionality
 │   │   ├── cpu/          # CPU implementations
 │   │   ├── memory/       # Memory components
 │   │   └── clock/       # Clock generation
-│   └── systems/          # Complete system integrations
+│   └── systems/          # System integration (legacy)
+├── configs/               # JSON system configuration files
+│   ├── mcs4_basic.json   # Basic MCS-4 system configuration
+│   └── mcs4_max.json     # Fig.1 MCS-4 Max system configuration
+├── programs/             # Binary program files
+│   ├── README.md        # Program documentation
+│   └── fibonacci.bin    # Example Fibonacci program
 ├── tests/               # Comprehensive test suite
 │   ├── README.md       # Test documentation
 │   ├── lib.rs         # Test library
@@ -111,22 +119,32 @@ rom.load_rom_data(program, 0) ?;
 rom.update(); // Process one clock cycle
 ```
 
-### System Simulation
+### JSON Configuration System
 
 ```rust
-use rusty_emu::systems::intel_mcs_4::IntelMCS4;
+use rusty_emu::system_config::SystemFactory;
 
-// Create complete MCS-4 system
+// Create system from JSON configuration
-let mut system = IntelMCS4::new();
+let factory = SystemFactory::new();
-
+let mut system = factory.create_from_json("configs/mcs4_basic.json") ?;
-// Load program
-let program = vec![0x12, 0x34, 0x56, 0x78];
-system.load_program(0, & program) ?;
 
 // Run simulation
 system.run();
 ```
 
+### Command Line Usage
+
+```bash
+# Run basic MCS-4 system
+cargo run -- --system basic
+
+# Run Fig.1 MCS-4 Max system
+cargo run -- --system max
+
+# Run with custom program
+cargo run -- --system basic --file programs/myprogram.bin
+```
+
 ## Testing
 
 The project includes a comprehensive test suite demonstrating that the `intel_400x` common functionality is highly
@@ -179,54 +197,70 @@ The test suite demonstrates:
 
 ## Key Technical Achievements
 
-### 1. Testability Demonstration
+### 1. JSON-Configurable System Architecture
+
+**Revolutionary Design Approach:**
+
+- ✅ **Configuration-Driven Systems**: Complete MCS-4 systems defined via JSON files
+- ✅ **Factory Pattern Implementation**: Dynamic system creation from configuration
+- ✅ **Component Registry**: Extensible component creation system
+- ✅ **Pin-Level Connection Management**: Automatic wiring of component interconnections
+- ✅ **Runtime System Selection**: Support for multiple system configurations
+
+### 2. Testability Demonstration
 
 **Answer to Original Question: CONFIRMED**
 
-- ✅ **Yes, it is absolutely possible to write meaningful test cases for the generic intel_400x file**
+- ✅ **Yes, it is absolutely possible to write meaningful test cases for complex systems**
 - ✅ **Pure functions**: Address assembly, clock logic, state queries are easily testable
 - ✅ **Mockable architecture**: Trait-based design enables comprehensive mocking
 - ✅ **Deterministic behavior**: State machines have predictable outcomes
 - ✅ **Integration testing**: Real components work correctly with common traits
 
-### 2. Comprehensive Test Suite
+### 3. Comprehensive Test Suite
 
-- **416 lines** of comprehensive test code
+- **416+ lines** of comprehensive test code
 - **Multiple testing strategies**: Unit, mock-based, property-based, integration
 - **High test coverage**: Core functionality, edge cases, error conditions
 - **Working examples**: Demonstrates practical usage patterns
+- **System-level testing**: End-to-end verification of complete systems
 
-### 3. Clean Architecture
+### 4. Clean Architecture
 
 - **Trait-based design**: Enables code reuse and testing
 - **Separation of concerns**: Clear boundaries between components
-- **Extensible structure**: Easy addition of new components
+- **Extensible structure**: Easy addition of new components and configurations
 - **Documentation**: Comprehensive documentation at all levels
+- **Professional organization**: Clean separation of configs, programs, source, and tests
 
 ## Development Status
 
 ### ✅ Completed
 
-- Core component architecture
+- Core component architecture with trait-based design
-- Intel 4001 ROM implementation
+- Intel 4001 ROM implementation with I/O ports
-- Intel 4004 CPU structure
+- Intel 4004 CPU structure and instruction framework
-- Common functionality module
+- Intel 4002 RAM implementation with refresh circuitry
-- Comprehensive test suite
+- Intel 4003 Shift Register implementation
+- JSON-based system configuration architecture
+- Comprehensive test suite (416+ lines of tests)
 - Documentation system
+- Binary program organization and management
+- Hard-coded system elimination
 
 ### 🚧 In Progress
 
-- Complete Intel 4004 instruction execution
+- Complete Intel 4004 instruction execution engine
-- Intel 4002 RAM implementation
+- System integration and timing verification
-- System integration and testing
+- Performance optimization and benchmarking
-- Performance optimization
 
 ### 📋 Planned
 
 - Additional CPU architectures (6502, 65C02)
-- Enhanced I/O device support
+- Enhanced I/O device support and peripherals
 - Development tools integration
-- Performance benchmarking
+- Advanced debugging and tracing features
+- Performance analysis and optimization tools
 
 ## Educational Value
 

src/lib.rs

@@ -1,3 +1,14 @@
+//! # Rusty Emulator Library
+//!
+//! A comprehensive Intel MCS-4 microprocessor simulator written in Rust.
+//!
+//! This library provides:
+//! - JSON-configurable system architecture for flexible system definition
+//! - Cycle-accurate hardware simulation of Intel 4004/4001/4002/4003 components
+//! - Comprehensive testing framework with multiple testing strategies
+//! - Extensible component system with trait-based architecture
+//! - Professional project organization with clean separation of concerns
+
 mod bus;
 pub mod component;
 pub mod components;

src/main.rs

@@ -1,3 +1,29 @@
+//! # Rusty Emulator - Main Binary
+//!
+//! Command-line interface for the Intel MCS-4 microprocessor simulator.
+//!
+//! This binary provides:
+//! - JSON-based system configuration loading
+//! - Binary program file loading and execution
+//! - Real-time system monitoring and status display
+//! - Multiple system type support (basic, max, fig1, custom JSON)
+//!
+//! ## Usage
+//!
+//! ```bash
+//! # Run basic MCS-4 system with default fibonacci program
+//! cargo run -- --system basic
+//!
+//! # Run Fig.1 MCS-4 Max system
+//! cargo run -- --system max
+//!
+//! # Run with custom program
+//! cargo run -- --system basic --file programs/myprogram.bin
+//!
+//! # Show help
+//! cargo run -- --help
+//! ```
+
 use rusty_emu::system_config::{SystemFactory, ConfigurableSystem};
 use std::env;
 use std::fs;

src/system_config.rs

@@ -1,3 +1,53 @@
+//! # JSON Configuration System
+//!
+//! This module provides a flexible, JSON-based system for configuring and creating MCS-4 systems.
+//!
+//! ## Key Features
+//!
+//! - **JSON System Definition**: Complete system configurations stored in JSON files
+//! - **Component Factory**: Dynamic creation of components from configuration
+//! - **Automatic Wiring**: Pin-level connection management between components
+//! - **Extensible Design**: Easy addition of new component types and connection patterns
+//! - **Runtime Configuration**: Support for multiple system configurations
+//!
+//! ## Usage
+//!
+//! ```rust
+//! use rusty_emu::system_config::SystemFactory;
+//!
+//! // Create system from JSON configuration
+//! let factory = SystemFactory::new();
+//! let mut system = factory.create_from_json("configs/mcs4_basic.json")?;
+//!
+//! // Run the configured system
+//! system.run();
+//! ```
+//!
+//! ## Configuration File Format
+//!
+//! ```json
+//! {
+//!   "name": "MySystem",
+//!   "description": "Custom MCS-4 system",
+//!   "components": {
+//!     "CPU": {
+//!       "single": {
+//!         "component_type": "intel_4004",
+//!         "name": "CPU_4004",
+//!         "properties": {"clock_speed": 750000}
+//!       }
+//!     }
+//!   },
+//!   "connections": {
+//!     "clock_signals": {
+//!       "connection_type": "clock",
+//!       "source": {"component": "CLOCK", "pin": "CLK"},
+//!       "targets": [{"component": "CPU", "pin": "PHI1"}]
+//!     }
+//!   }
+//! }
+//! ```
+
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use crate::component::Component;