Claim: The ä character set has numerous codes for 8_128 under Mazovia encoding, which is utilized under DOS based on OEM-US.
Evidence: Mazovia encoding is used under DOS to represent Polish texts. OEM-US ä
00E4 Ä (lower case ä) is a character that represents either a letter from several extended Latin alphabets, or the letter A with an umlaut mark or diaeresis. à
00E0 ą
0105 Code page 667 / 790 â
00E2