環境変数 S9XKEYS
	Quit,A,B,X,Y,L,R,START,SELECT,LEFT,RIGHT,UP,DOWN,L+U,L+D,R+U,R+D
	の順番で下記キーコードを指定します。
	(QT版SDLでサポートされるキーコードのみ有効)

	環境変数をセットしていない場合は以下の指定と同様です。

	export S9XKEYS=27,100,99,115,120,97,122,13,32,103,106,117,110,121,98,105,109

	カーソルキーは無条件でアサインされ上記8方向キーと２重アサインとなります。

	SDLK_BACKSPACE		= 8,
	SDLK_TAB		= 9,
	SDLK_CLEAR		= 12,
	SDLK_RETURN		= 13,
	SDLK_PAUSE		= 19,
	SDLK_ESCAPE		= 27,
	SDLK_SPACE		= 32,
	SDLK_EXCLAIM		= 33,
	SDLK_QUOTEDBL		= 34,
	SDLK_HASH		= 35,
	SDLK_DOLLAR		= 36,
	SDLK_AMPERSAND		= 38,
	SDLK_QUOTE		= 39,
	SDLK_LEFTPAREN		= 40,
	SDLK_RIGHTPAREN		= 41,
	SDLK_ASTERISK		= 42,
	SDLK_PLUS		= 43,
	SDLK_COMMA		= 44,
	SDLK_MINUS		= 45,
	SDLK_PERIOD		= 46,
	SDLK_SLASH		= 47,
	SDLK_0			= 48,
	SDLK_1			= 49,
	SDLK_2			= 50,
	SDLK_3			= 51,
	SDLK_4			= 52,
	SDLK_5			= 53,
	SDLK_6			= 54,
	SDLK_7			= 55,
	SDLK_8			= 56,
	SDLK_9			= 57,
	SDLK_COLON		= 58,
	SDLK_SEMICOLON		= 59,
	SDLK_LESS		= 60,
	SDLK_EQUALS		= 61,
	SDLK_GREATER		= 62,
	SDLK_QUESTION		= 63,
	SDLK_AT			= 64,
	/* 
	   Skip uppercase letters
	 */
	SDLK_LEFTBRACKET	= 91,
	SDLK_BACKSLASH		= 92,
	SDLK_RIGHTBRACKET	= 93,
	SDLK_CARET		= 94,
	SDLK_UNDERSCORE		= 95,
	SDLK_BACKQUOTE		= 96,
	SDLK_a			= 97,
	SDLK_b			= 98,
	SDLK_c			= 99,
	SDLK_d			= 100,
	SDLK_e			= 101,
	SDLK_f			= 102,
	SDLK_g			= 103,
	SDLK_h			= 104,
	SDLK_i			= 105,
	SDLK_j			= 106,
	SDLK_k			= 107,
	SDLK_l			= 108,
	SDLK_m			= 109,
	SDLK_n			= 110,
	SDLK_o			= 111,
	SDLK_p			= 112,
	SDLK_q			= 113,
	SDLK_r			= 114,
	SDLK_s			= 115,
	SDLK_t			= 116,
	SDLK_u			= 117,
	SDLK_v			= 118,
	SDLK_w			= 119,
	SDLK_x			= 120,
	SDLK_y			= 121,
	SDLK_z			= 122,
	SDLK_DELETE		= 127,
	/* Arrows + Home/End pad */
	SDLK_UP			= 273,
	SDLK_DOWN		= 274,
	SDLK_RIGHT		= 275,
	SDLK_LEFT		= 276,
	SDLK_INSERT		= 277,
	SDLK_HOME		= 278,
	SDLK_END		= 279,
	SDLK_PAGEUP		= 280,
	SDLK_PAGEDOWN		= 281,

	/* Function keys */
	SDLK_F1			= 282,
	SDLK_F2			= 283,
	SDLK_F3			= 284,
	SDLK_F4			= 285,
	SDLK_F5			= 286,
	SDLK_F6			= 287,
	SDLK_F7			= 288,
	SDLK_F8			= 289,
	SDLK_F9			= 290,
	SDLK_F10		= 291,
	SDLK_F11		= 292,
	SDLK_F12		= 293,
	SDLK_F13		= 294,
	SDLK_F14		= 295,
	SDLK_F15		= 296,

	/* Key state modifier keys */
	SDLK_NUMLOCK		= 300,
	SDLK_CAPSLOCK		= 301,
	SDLK_SCROLLOCK		= 302,
	SDLK_RSHIFT		= 303,
	SDLK_LSHIFT		= 304,
	SDLK_RCTRL		= 305,
	SDLK_LCTRL		= 306,
	SDLK_RALT		= 307,
	SDLK_LALT		= 308,
	SDLK_RMETA		= 309,
	SDLK_LMETA		= 310,
	SDLK_LSUPER		= 311,		/* Left "Windows" key */
	SDLK_RSUPER		= 312,		/* Right "Windows" key */
	SDLK_MODE		= 313,		/* "Alt Gr" key */
	SDLK_COMPOSE		= 314,		/* Multi-key compose key */

	/* Miscellaneous function keys */
	SDLK_HELP		= 315,
	SDLK_PRINT		= 316,
	SDLK_SYSREQ		= 317,
	SDLK_BREAK		= 318,
	SDLK_MENU		= 319,
	SDLK_POWER		= 320,		/* Power Macintosh power key */
	SDLK_EURO		= 321,		/* Some european keyboards */
	SDLK_UNDO		= 322,		/* Atari keyboard has Undo */