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For Aquamacs (emacs), how can I configure the size of the window when it starts? (E.g. have it always start fullscreen, or better - exactly half of the screen.)

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+1 for realizing that half the screen is a better size for an editor than fullscreen – Doug Harris Aug 27 '09 at 20:13
up vote 1 down vote accepted

You should customize the variables "default-frame-alist" and "initial-frame-alist" via ellisp in your init.el file or through M-x customize.

See the fine manual: 29.3.2 Initial Frame Parameters

For example, to set frames to half the width and height of a 1280 x 800 display:

(setq default-frame-alist (add-to-list 'default-frame-alist '(width . 640)))
(setq default-frame-alist (add-to-list 'default-frame-alist '(height  . 400)))
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