I'm only using the standard CGA ANSI charset. Those frame double/single line corner symbols that is displaying wrong is pretty common in text programs. Weird that they has been replaced with letters in some font.

Thanks a lot for the photos and recordings, very interesting to see and hear it on other hardware! I think the graphical glitch is related to some localized VGA font, maybe European or something. I also had a similar but different looking glitch with a Cyrillic font (that replaced EQ bars with a …

Hopefully you guys won't mind this little bit of shameless self-promotion. I believe it may reach some people here who is interested in this kind of stuff. PC Speaker was one of earliest and most primitive sound devices of personal computers, intended to produce very basic system beeps. It is only …