Added console for displaying the system state

Corrected behaviour and tests

programs/README.md

@@ -6,18 +6,30 @@ This directory contains binary program files for the Intel MCS-4 emulator.
 
 ### fibonacci.bin
 - **Size:** 33 bytes (16 instructions × 2 bytes each + 1 extra byte)
-- **Description:** Fibonacci sequence generator
+- **Description:** Basic Fibonacci sequence generator (stores results in RAM)
 - **Algorithm:** Calculates first 8 Fibonacci numbers using registers and RAM
 - **Instructions Used:** LDM, LD, WRM, IAC, ADD, JCN, NOP
+- **Output:** Results stored in RAM locations 0-7 (not visible to user)
+
+### fibonacci_output.bin ✨ **RECOMMENDED**
+- **Size:** 55 bytes (27 instructions × 2 bytes each + 1 extra byte)
+- **Description:** Enhanced Fibonacci sequence generator with output port visibility
+- **Algorithm:** Calculates first 8 Fibonacci numbers and outputs them to output ports
+- **Instructions Used:** LDM, LD, WRM, IAC, ADD, JCN, NOP, SRC
+- **Output:** Each Fibonacci number visible on output ports 0-7 during execution
+- **Features:** Real-time visibility of calculation progress
 
 ## Usage
 
 Programs are automatically loaded by the emulator. Use the `--file` option to specify a different program:
 
 ```bash
-# Use default fibonacci program
+# Use default fibonacci program (RAM-based)
 cargo run -- --system basic
 
+# Use enhanced fibonacci program with output ports ✨
+cargo run -- --system basic --file programs/fibonacci_output.bin
+
 # Use specific program
 cargo run -- --system basic --file programs/myprogram.bin
 ```
@@ -31,4 +43,19 @@ cargo run -- --system basic --file programs/myprogram.bin
 
 ## Program Format
 
-MCS-4 programs are stored as raw binary data where each instruction is represented as 8-bit bytes. Multi-byte instructions (like addresses) use big-endian format.
+MCS-4 programs are stored as raw binary data where each instruction is represented as 8-bit bytes. Multi-byte instructions (like addresses) use big-endian format.
+
+## Program Development Tips
+
+### Making Programs Visible
+- **Use Output Ports:** Write results to output ports (0x14-0x17) for visibility
+- **SRC Instruction:** Select output port with `SRC` before `WRM`
+- **Real-time Output:** Numbers appear on output ports during execution
+- **System Monitoring:** Watch RAM contents and output port states in real-time
+
+### Example Output Port Usage
+```asm
+LDM 5        ; Load value 5
+SRC 0        ; Select output port 0
+WRM          ; Write to output port 0 (now visible to user)
+```