*FX229	Write ESCAPE key status:
	*FX229,0 gives [ESCAPE] its normal function;
	*FX229,1 causes [ESCAPE] (or the key selected by *FX220) to
	generate its ASCII code.
*FX230	Write flags determining ESCAPE effects.
*FX231	Write IRQ bit mask for user 6522.
*FX232	Write IRQ bit mask for 6850 (RS232 (optional)).
*FX233	Write interrupt bit mask for system 6522.
*FX236	Write character destination status.
*FX237„	Write cursor editing status.
*FX238	Set base number for numeric keypad (default setting 48 for
	keypad 0).
*FX241	Not used.
*FX244	Write soft key consistency flag.
*FX245	Write printer destination flag.
*FX246	Write printer ignore character.
*FX247 „„	Intercept BREAK vector.
*FX249
*FX254	Set effect of [SHIFT] on numeric keypad:
	*FX254,0 causes [SHIFT] to operate (i.e. [SHIFT]+keypad 0
	generates !) ;
	*FX254,1 makes [SHIFT] have no effect.
*FX255	Write start-up options.
App 4.8