Back in the day I learned cp437 and its mapping to cp866, and was able to read cyrillic DOS programs without altering the character generator in the graphics ca

Back in the day I learned cp437 and its mapping to cp866, and was able to read cyrillic DOS programs without altering the character generator in the graphics card. This was useful on a computer with a sort of Hercules graphics card which didn’t have the capability in text mode and behaved like IBM MDA. Needless to say, my knowledge got outdated fairly quickly.