The gif picture here shows a Mac keyboard with ANSI-dvorak layout.
This layout differs in three places from the dvorak layout:

keycode 12:  (us.map -_)	dvorak [{	ANSI-dvorak ][
keycode 13:  (us.map =+)	dvorak ]}	ANSI-dvorak =+
keycode 27:  (us.map ]})	dvorak =+	ANSI-dvorak {}

Of course ANSI-dvorak is illogical in that both parentheses
are shifted, the brackets are on one key with the closing
one unshifted, the braces are on one key with the opening
one unshifted.
The description given by Marcus Brooks in dvorak.txt
coincides completely with our dvorak.map.
==================================================================
The xmodmap file in dvorak-l.xmodmap differs from dvorak-l.map
in maybe 4 places:

keycode  2:  (us.map 1!)	dvorak-l [{	dvorak-l.xmodmap =+
keycode  3:  (us.map 2@)	dvorak-l ]}	dvorak-l.xmodmap ][
keycode 27:  (us.map ]})	dvorak-l =+	dvorak-l.xmodmap }{
keycode 14:  (us.map <BS>)	dvorak-l <BS>	dvorak-l.xmodmap \|
==================================================================
The xmodmap file in dvorak-r.xmodmap differs from dvorak-r.map
in maybe 4 places:

keycode 12:  (us.map -_)	dvorak-r [{	dvorak-r.xmodmap ][
keycode 13:  (us.map =+)	dvorak-r ]}	dvorak-r.xmodmap =+
keycode 27:  (us.map ]})        dvorak-r =+     dvorak-r.xmodmap }{
keycode 14:  (us.map <BS>)	dvorak-r <BS>	dvorak-r.xmodmap \|
==================================================================