Actually, ASCII is a 7-bit standard. Characters 128 through 255 are vendor-specific. The IBM PC and clones use a buttload of these characters for line drawing, whereas the Macintosh uses most of them for accented letters.

Some of the characters the Mac has and the vanilla DOS PC doesn't: Portuguese vowels; the ae, oe, fl, and fi ligatures; smart quotes and European quotes; the dagger and double dagger marks; and the em dash.

If you haven't had enough weird characters in vendor-extended ASCII, check out Unicode.

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