Created factory for system creation.

Systems are now defined in JSON rather than hard-coded

README.md

@@ -1,10 +1,12 @@
 # Rusty Emulator
 
-A comprehensive Intel 4004/4001 microprocessor simulator written in Rust, featuring cycle-accurate emulation and extensive testing capabilities.
+A comprehensive Intel 4004/4001 microprocessor simulator written in Rust, featuring 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:
+Rusty Emulator is a detailed simulation of Intel's first microprocessor system, the MCS-4 (Micro Computer System). It
+provides:
 
 - **Hardware-Accurate Simulation**: Cycle-accurate timing where possible
 - **Comprehensive Testing**: Extensive test suite with multiple testing strategies
@@ -103,7 +105,7 @@ let mut rom = Intel4001::new("ROM1".to_string());
 
 // Load program data
 let program = vec![0x12, 0x34, 0x56, 0x78];
-rom.load_rom_data(program, 0)?;
+rom.load_rom_data(program, 0) ?;
 
 // Use in simulation
 rom.update(); // Process one clock cycle
@@ -119,7 +121,7 @@ let mut system = IntelMCS4::new();
 
 // Load program
 let program = vec![0x12, 0x34, 0x56, 0x78];
-system.load_program(0, &program)?;
+system.load_program(0, & program) ?;
 
 // Run simulation
 system.run();
@@ -127,7 +129,8 @@ system.run();
 
 ## Testing
 
-The project includes a comprehensive test suite demonstrating that the `intel_400x` common functionality is highly testable:
+The project includes a comprehensive test suite demonstrating that the `intel_400x` common functionality is highly
+testable:
 
 ### Test Categories
 
@@ -154,6 +157,7 @@ cargo test -- --nocapture
 ### Test Results
 
 The test suite demonstrates:
+
 - ✅ **Main library compiles successfully**
 - ✅ **Core functionality works correctly**
 - ✅ **State management operates properly**
@@ -176,7 +180,9 @@ The test suite demonstrates:
 ## Key Technical Achievements
 
 ### 1. Testability Demonstration
+
 **Answer to Original Question: CONFIRMED**
+
 - ✅ **Yes, it is absolutely possible to write meaningful test cases for the generic intel_400x file**
 - ✅ **Pure functions**: Address assembly, clock logic, state queries are easily testable
 - ✅ **Mockable architecture**: Trait-based design enables comprehensive mocking
@@ -184,12 +190,14 @@ The test suite demonstrates:
 - ✅ **Integration testing**: Real components work correctly with common traits
 
 ### 2. Comprehensive Test Suite
+
 - **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
 
 ### 3. Clean Architecture
+
 - **Trait-based design**: Enables code reuse and testing
 - **Separation of concerns**: Clear boundaries between components
 - **Extensible structure**: Easy addition of new components
@@ -198,6 +206,7 @@ The test suite demonstrates:
 ## Development Status
 
 ### ✅ Completed
+
 - Core component architecture
 - Intel 4001 ROM implementation
 - Intel 4004 CPU structure
@@ -206,12 +215,14 @@ The test suite demonstrates:
 - Documentation system
 
 ### 🚧 In Progress
+
 - Complete Intel 4004 instruction execution
 - Intel 4002 RAM implementation
 - System integration and testing
 - Performance optimization
 
 ### 📋 Planned
+
 - Additional CPU architectures (6502, 65C02)
 - Enhanced I/O device support
 - Development tools integration
@@ -245,7 +256,8 @@ This project demonstrates:
 
 ## License
 
-This project is educational and demonstrates microprocessor simulation techniques. See individual source files for specific licensing information.
+This project is educational and demonstrates microprocessor simulation techniques. See individual source files for
+specific licensing information.
 
 ## Acknowledgments
 
@@ -255,4 +267,5 @@ This project is educational and demonstrates microprocessor simulation technique
 
 ---
 
-**Note**: This is an educational simulation of historical hardware. While it aims for accuracy, some aspects are simplified for educational purposes and modern Rust implementation requirements.
+**Note**: This is an educational simulation of historical hardware. While it aims for accuracy, some aspects are
+simplified for educational purposes and modern Rust implementation requirements.