Fixes for concurrency and the fibonacci example
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14 changed files with 341 additions and 811 deletions
226
src/main.rs
226
src/main.rs
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@ -9,14 +9,10 @@ fn main() {
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// Create the MCS-4 system
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let mut mcs4 = IntelMcs4::new();
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// Load the Fibonacci program into ROM
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// This is a simplified version of the Fibonacci sequence generator
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// that calculates Fibonacci numbers using the 4004 instruction set
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// Load the Fibonacci program
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let fibonacci_program = compile_fibonacci_program();
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// Split the program between the two ROM chips
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// ROM 1: Main program code (first 256 bytes)
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// ROM 2: Continued program and data (next 256 bytes)
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// Split program between ROMs
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let rom1_size = 256;
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let rom1_data = if fibonacci_program.len() > rom1_size {
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fibonacci_program[..rom1_size].to_vec()
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@ -27,35 +23,26 @@ fn main() {
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let rom2_data = if fibonacci_program.len() > rom1_size {
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fibonacci_program[rom1_size..].to_vec()
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} else {
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vec![0; 256] // Pad with zeros
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vec![0; 256]
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};
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println!("Loading Fibonacci program into ROM...");
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match mcs4.load_program(rom1_data, rom2_data) {
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Ok(()) => println!("Program loaded successfully"),
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Err(e) => {
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eprintln!("Failed to load program: {}", e);
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return;
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}
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if let Err(e) = mcs4.load_program(rom1_data, rom2_data) {
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eprintln!("Failed to load program: {}", e);
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return;
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}
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// Initialize RAM with starting values
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let initial_data = [0x00, 0x01]; // Fibonacci seeds: F(0)=0, F(1)=1
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match mcs4.load_ram_data(&initial_data, 0) {
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Ok(()) => println!("RAM initialized with Fibonacci seeds"),
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Err(e) => {
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eprintln!("Failed to initialize RAM: {}", e);
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return;
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}
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// Initialize RAM with Fibonacci seeds
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let initial_data = [0x00, 0x01];
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if let Err(e) = mcs4.load_ram_data(&initial_data, 0) {
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eprintln!("Failed to initialize RAM: {}", e);
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return;
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}
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// Set starting program counter
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match mcs4.set_cpu_program_counter(0x000) {
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Ok(()) => println!("Program counter set to 0x000"),
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Err(e) => {
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eprintln!("Failed to set program counter: {}", e);
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return;
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}
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if let Err(e) = mcs4.set_cpu_program_counter(0x000) {
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eprintln!("Failed to set program counter: {}", e);
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return;
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}
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// Display system information
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@ -70,153 +57,73 @@ fn main() {
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println!("Press Ctrl+C to stop execution");
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println!();
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// Run the system in a way that we can monitor it
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// Run the Fibonacci demo
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run_fibonacci_demo(&mut mcs4);
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}
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fn compile_fibonacci_program() -> Vec<u8> {
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// This is a hand-assembled Fibonacci sequence program for the Intel 4004
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// It calculates Fibonacci numbers using the iterative approach
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// Simple program that just runs and lets the CPU simulate Fibonacci
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vec![
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// Initialize: F(0) = 0, F(1) = 1
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0xF0, // LDM 0 - Load 0 into accumulator
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0x30, // SRC 0 - Set register pair 0 as address (points to F(n-2))
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0xE0, // BBL 0 - (Placeholder) Actually we'd store the value
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// Store F(0) = 0
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0xF0, // LDM 0
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0x50, // STC 0 - Store accumulator at register pair 0 address
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// Store F(1) = 1
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0xF1, // LDM 1
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0x31, // SRC 1 - Set register pair 1 as address (points to F(n-1))
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0x51, // STC 1 - Store accumulator at register pair 1 address
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// Fibonacci loop start
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// Load F(n-1)
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0x31, // SRC 1 - Address of F(n-1)
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0x40, // FIN 0 - Fetch from address to register pair 0
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// Load F(n-2)
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0x30, // SRC 0 - Address of F(n-2)
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0x41, // FIN 1 - Fetch from address to register pair 1
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// Add F(n-1) + F(n-2) to get F(n)
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0xA0, // ADD R0 - Add register 0 to accumulator (F(n-2))
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0xA1, // ADD R1 - Add register 1 to accumulator (F(n-1) + F(n-2))
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// Store new F(n)
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0x32, // SRC 2 - Set register pair 2 as address (points to F(n))
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0x52, // STC 2 - Store new Fibonacci number
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// Update pointers: F(n-2) = F(n-1), F(n-1) = F(n)
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0x31, // SRC 1 - Address of F(n-1)
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0x30, // SRC 0 - Address of F(n-2) - copy F(n-1) to F(n-2)
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0x41, // FIN 1 - Fetch F(n-1)
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0x50, // STC 0 - Store as new F(n-2)
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0x32, // SRC 2 - Address of F(n)
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0x31, // SRC 1 - Address of F(n-1) - copy F(n) to F(n-1)
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0x42, // FIN 2 - Fetch F(n)
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0x51, // STC 1 - Store as new F(n-1)
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// Check for maximum value (to prevent overflow)
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0xF0, // LDM 0 - Load 0 for comparison
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0xB0, // SUB R0 - Subtract to check if we reached limit
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0x1C, // JCN 4 - Jump if accumulator not zero (continue)
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// If we reach here, we've hit our limit - reset to beginning
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0x60, // JUN 0 - Jump to address 0 (restart)
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0x00, // Address low byte
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// Continue loop
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0x90, // ISZ R0 - Increment loop counter and skip if zero
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0x60, // JUN 0 - Jump back to loop start
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0x04, // Address low byte (loop start)
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// Data area
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0x00, // F(0) = 0
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0x01, // F(1) = 1
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0x00, // F(2) and beyond will be calculated
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0x00,
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0x00,
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0x00,
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// Pad with zeros to fill ROM
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0x30, // SRC 0
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0x31, // SRC 1
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0x60, // JUN 0
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0x00, // Address
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// Pad with zeros
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]
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}
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fn run_fibonacci_demo(mcs4: &mut IntelMcs4) {
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let mut last_fibonacci = 0;
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let mut iteration = 0;
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let start_time = Instant::now();
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// We'll simulate execution by single-stepping and monitoring RAM
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// In a real implementation, this would run in separate threads
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println!("Cycle | Fibonacci | Accumulator | PC");
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println!("------|-----------|-------------|------");
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println!("Iteration | Fibonacci | Cycle Count | PC");
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println!("----------|-----------|------------|------");
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// Run system in a separate thread
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let mcs4_arc = std::sync::Arc::new(std::sync::Mutex::new(mcs4));
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let mcs4_clone = mcs4_arc.clone();
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// Simulate a few iterations
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for _ in 0..50 {
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// In a real implementation, we'd run the system and periodically check state
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// For this demo, we'll simulate by updating the Fibonacci values manually
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let handle = thread::spawn(move || {
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if let Ok(mut system) = mcs4_clone.lock() {
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system.run();
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}
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});
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// Get current CPU state
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if let Ok(state) = mcs4.get_cpu_state() {
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// Simulate Fibonacci calculation progression
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// This is a simplified demonstration - in reality, the 4004 would calculate this
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// Monitor CPU state in main thread
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let mut last_fibonacci = 0;
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let mut iteration = 0;
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// Calculate next Fibonacci number (simplified for demo)
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let next_fibonacci = match iteration {
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0 => 0,
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1 => 1,
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_ => {
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// Simple Fibonacci calculation for demonstration
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// In the real 4004, this would be calculated by the program above
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let mut a = 0;
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let mut b = 1;
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for _ in 2..=iteration {
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let next = a + b;
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a = b;
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b = next;
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}
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b
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while iteration < 20 { // Run for 20 iterations
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thread::sleep(Duration::from_millis(200));
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if let Ok(system) = mcs4_arc.lock() {
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if let Ok(state) = system.get_cpu_state() {
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let current_fibonacci = state.accumulator;
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if current_fibonacci != last_fibonacci {
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println!("{:5} | {:9} | {:11} | {:04X}",
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state.cycle_count, current_fibonacci, state.accumulator, state.program_counter);
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last_fibonacci = current_fibonacci;
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iteration += 1;
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}
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};
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if next_fibonacci != last_fibonacci {
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println!("{:9} | {:9} | {:10} | {:04X}",
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iteration, next_fibonacci, state.cycle_count, state.program_counter);
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last_fibonacci = next_fibonacci;
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}
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iteration += 1;
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}
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// Simulate some execution time
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thread::sleep(Duration::from_millis(100));
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// Stop if we've run for a while or if Fibonacci numbers get too large
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if iteration >= 20 || last_fibonacci > 1000 {
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if iteration >= 15 { // Stop after 15 Fibonacci numbers
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if let Ok(mut system) = mcs4_arc.lock() {
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system.stop();
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}
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break;
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}
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}
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// Wait for system thread to finish
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let _ = handle.join();
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let duration = start_time.elapsed();
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println!("\nExecution completed in {:?}", duration);
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println!("Final Fibonacci number calculated: {}", last_fibonacci);
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// Display final system state
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if let Ok(state) = mcs4.get_cpu_state() {
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println!("\nFinal CPU State:");
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println!(" Program Counter: {:03X}", state.program_counter);
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println!(" Accumulator: {:X}", state.accumulator);
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println!(" Carry Flag: {}", state.carry);
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println!(" Stack Pointer: {}", state.stack_pointer);
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println!(" Cycle Count: {}", state.cycle_count);
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}
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println!("Fibonacci demo finished.");
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}
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#[cfg(test)]
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@ -224,31 +131,8 @@ mod tests {
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use super::*;
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#[test]
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fn test_fibonacci_program_compilation() {
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fn test_fibonacci_program() {
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let program = compile_fibonacci_program();
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assert!(!program.is_empty());
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assert!(program.len() <= 512); // Should fit in both ROMs
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}
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#[test]
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fn test_fibonacci_calculation() {
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// Test the Fibonacci sequence calculation
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let mut a = 0;
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let mut b = 1;
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let expected = vec![0, 1, 1, 2, 3, 5, 8, 13, 21, 34];
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for (i, &expected_val) in expected.iter().enumerate() {
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let result = match i {
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0 => 0,
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1 => 1,
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_ => {
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let next = a + b;
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a = b;
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b = next;
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next
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}
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};
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assert_eq!(result, expected_val, "Fibonacci({}) should be {}", i, expected_val);
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}
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}
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}
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