In this step, we simulate the earliest form of CPU logic from the 1950s by:

• Defining a custom Assembly language
• Writing an assembler in Python to convert .asm files to .vdos bytecode
• Building a simple virtual CPU to execute the bytecode

> ACC is the main CPU register (Accumulator)

Register:
- ACC (Accumulator)

Memory:
- A = 0
- B = 0
- C = 0
</code></pre>
<p>Defined in <code inline="">vm.py</code> as:</p>
<pre><code class="language-python">memory = {
    "A": 0,
    "B": 0,
    "C": 0
}

# Step 1 – Assemble
python assembler.py
Step 2 – Run bytecode
python vm.py

🚀 Running VDOS Bytecode:
🔹 LOAD 5
➕ ADD → ACC = 8
💾 STORE ACC (8) → A
🔹 LOAD 2
➕ ADD → ACC = 6
💾 STORE ACC (6) → B
⛔ HALT
📦 Final Memory State:
🧠 A = 8
🧠 B = 6
🧠 C = 0

• How early CPUs executed simple instruction sets

• Binary translation from human-readable commands to bytecode

• Simulated memory and register operations

• Foundation for real bootloaders and kernels

Step 02 – Bootloader with NASM and QEMU

Writing a real 512-byte boot sector
BIOS-level execution on QEMU
Print “Hello from VDOS” from real-mode assembly

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