How can I convert extended ascii to a System.String?

Question

For example: \"½\" or ASCII DEC 189. When I read the bytes from a text file the byte[] contains the valid value, in this case 189.

Converting to Unicode results in

Answer 1

The old PC-8 or Extended ASCII character set was around before IBM and Microsoft introduced the idea of Code Pages to the PC world. This WAS Extended ASCII - in 1982. In fact, it was the ONLY character set available on PC's at the time, up until the EGA card allowed you to load other fonts in to VRAM.

This was also the default standard for ANSI terminals, and nearly every BBS I dialed up to in the 80's and early 90's used this character set for displaying menus and boxes.

Here's the code to turn 8-bit Extended ASCII in to Unicode text. Note the key bit of code: the GetEncoding("437"). That used Code Page 437 to translate the 8-bit ASCII text to the Unicode equivalent.

    string ASCII8ToString(byte[] ASCIIData)
    {
        var e = Encoding.GetEncoding("437");
        return e.GetString(ASCIIData);
    }