Debugging the VGA Buffer in MNIST-OS

The Problem

When making the MNIST-OS, I wanted to visualize the weights updating in real-time. I mapped the VGA memory buffer at `0xB8000` but all I got was garbage.

The Fix

I realized I was writing to the text-mode buffer instead of switching to Mode 13h.

Warning: Always check your BIOS interrupt vectors before writing to video memory.

```assembly mov ax, 0x13 int 0x10 ```

Now I see the weights converging beautifully.