keyboard does not read the third key if I press more than two keys at the same time

What you’re experiencing is likely due to the limitations of your keyboard's hardware and its key rollover capabilities. Here’s a breakdown of the concepts involved:

Key Rollover

• Key Rollover refers to the number of keys that can be pressed simultaneously while still being recognized by the keyboard. Most keyboards have a limit, commonly referred to as N-Key Rollover (NKRO) for high-end keyboards, which allows for multiple keys to be pressed at the same time without any issues.

6-Key Rollover (6KRO)

• If your keyboard supports 6-Key Rollover (6KRO), it means it can detect up to 6 keys pressed simultaneously. However, the specific keys that can be pressed together may vary depending on the keyboard's design and the circuitry used.

Why Certain Keys Don’t Work Together

• Matrix Layout: Most keyboards use a matrix layout where keys are connected in a grid. When you press certain combinations, the electrical signals may overlap or short-circuit in a way that prevents some keys from being registered.
• Ghosting: This is a phenomenon where the keyboard mistakenly registers a key press that wasn’t actually made. This can happen with certain combinations of keys based on the keyboard's design.
• Specific Combinations: In your case, pressing Q and E might create a signal that interferes with the signals for A and D. This is a common issue with many keyboards, especially lower-end or non-gaming models.

Solutions

• Try a Different Keyboard: If you need to press those keys simultaneously frequently (like in gaming), consider upgrading to a keyboard with NKRO capability, which can handle more simultaneous key presses without conflict.
• Check Keyboard Settings: Some keyboards have settings or software that can alter key behavior or enable NKRO, especially on gaming keyboards.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful.