Commodore 64 in a shader

Neat, but isn&#x27;t this just a c64 text mode screen buffer fixed-font renderer in a shader? I mean, even the most basic statement &quot;print 2&quot; doesn&#x27;t work.<p>Still, pretty cool to see a shader emulating a text mode screen buffer.

This one is a Apple ][ in a shader, complete with NTSC emulation.<p><pre><code> http:&#x2F;&#x2F;porkrind.org&#x2F;a2</code></pre>

A shader is a thing in a graphics card, right?<p>Obviously that description is insufficient. What are shaders?