*FX217	Write number of lines printed since last page halt.
*FX218	Write number of items in VDU queue.
*FX219	Write character value returned by [TAB] (default setting 9, i.e.
-	cursor right). For example:
	*FX219, 127 makes [TAB] equivalent to [DELETE]
*FX220	Write ESCAPE character (default setting 27). For example:
	*FX220,32 makes [SPACE BAR] the [ESCAPE] key.
*FX221-	Write input buffer code interpretation status.
*FX224
*FX225	Write function key status:
	*FX225,0 disables the function keys;
	*FX225,1 gives the keys their normal function of generating
	strings.
	*FX225,2 returns a code representing the key preceded by a
	NULL.
	The function keys may also be set to generate a single ASCII
	code using *FX225,n (where n is the base number in the range 3
	-255). This has the effect of assigning ASCII n to [f0], ASCII
	n+l to [f1], ASCII n+2 to [f2] etc. So, for example:
	*FX225,65 causes [f0] to generate ASCII 65 (A), [f1] to
	generate ASCII 66 (B), [f2] to generate ASCII 67
	(C) etc.
*FX226	Set base number for [„„SHIFT]+function key depressions (default
	setting 128). For example:
	*FX226,97 causes [SHIFT]+[f0] to generate ASCII 97 (a),
	[SHIFT]+[f1]to generate ASCII 98 (b) etc.
*FX227	Set base number for [CTRL]+function key depressions (default
	setting 144). For example:
	*FX227,48 causes [CTRL]+[f0] to generate ASCII 48 (0),
	[CTRL]+[f1]to generate ASCII 49 (1) etc.
*FX228	Set base number for [SHIFT„„]+[CTRL„„]+function key depressions
	(default setting: no effect). For example:
	*FX228,200 causes [SHIFT]+[CTRL]+[f0] to generate ASCII
	200, [SHIFT]+[CTRL]+[f1]to generate ASCII 201
	etc.
App 4 .7