Mike's Place

The bizarre keyboard processing, described below, can be seen fairly easily in Notepad or TextEdit. Hold down the A and S keys, and press any other key in Columns 1 or 2. You won't see the newly pressed key appear in the editor, though you will see the repeating key stop.

Now try holding down the A and W keys. 1 and 2 and Z and X will appear when pressed, but Q and S won't.

Why?