Apple Macintosh PowerBook 145 - Manual (Page 271)

To type a character with a diacritical mark (such as an acute accent
or an umlaut), you press the Option key along with a specific
letter key, and then type the character.
Diacritical mark Key combination
Grave accent ( ` ) Option–`, then type the character
Acute accent ( ´ ) Option–e, then type the character
Circumflex (^) Option–i, then type the character
Tilde (~) Option–n, then type the character
Umlaut ( ¨ ) Option–u, then type the character
The letter “c” with a cedilla (ç) Option–c
If the character appears after the diacritical mark (rather than
with it), then the marked character is not available in the font
you’re using.
Appendix A: Keyboard and Character Sets 255
The highlighted key represents the
key held down on the keyboard—in
this case, the Option key.
Characters
available in
the Chicago
font when the
Option key is
pressed