[int_19h]

In DOS days, codepage 437 was commonly referred to as "ASCII" colloquially in countries where some other encoding was in use for the national script.

[umanwizard]

Interesting to know, thanks!

[MisterTea]

Yup, what the GP said. It was a common mistake for people to assume ASCII included CP 437 characters back in the DOS days. Even I made that assumption when I was a kid.