Output routine does not handle characters < 0x20 correctly

[SvOlli]

Hello, take a look at https://youtu.be/cUF6qra-0lk?t=512 .

There you'll see an output routine running, outputting all characters. The output differs because you convert all characters by or'ing 0x20 (except for 0x0d). what should be done is that you print nothing, but still trigger the output delay.