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	APILib Library SDK
	(c) NeXO Software - Benoit SCHERRER / Ibrahim

	Tutorial : Basic Functions. It is written for 
	 beginners in ti92/ti92+/ti89 assembly programming,
	 to make them able to write nice program as fast
	 as possible.

	Difficulty :
	[ ][ ][ ][ ][ ]
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	I....... Wait that the user press a key
	II...... Clear the screen
	III..... Font functions
	IV...... Get the address of a handle
	V....... Set/Get the APD value


	I. Wait that the user press a key
	---------------------------------
When you want to wait for a key from the user, just use the
following function :

	jsr	api92::WaitKey

It returns in d0 the internal code of the key pressed. Only
this register is modified.

Notice that it support the APD (Auto Power Down), and that
it won't work if interruptions are disabled.


	II. Clear the screen
	--------------------
Two functions can be used to clear the screen :

	*	jsr	api92::ClearScreen 
	It clear the screen, and redraw the status bar

	*	jsr	api92::ZapScreen
	The screen is completly cleared, totally blank


	III. Font functions
	------------------
Font values :	0 = small font
		1 = medium font
		2 = large font

* Set the font
	To set the current font used, you have the function 
	moveq.w	#0,d0
	jsr	api92::SetFont

	You put in d0 the font to set ( 0, 1 or 2), and then
	you call the function. It changes no register

* Get the font
	To get the font, just use the function :
	jsr	api92::GetFont
	
	It returns in d0 the current font used (0, 1 or 2),
	and changes no other register.


	IV. Get the address of a handle
	-------------------------------
To get the address of a handle, you have two possibilities :
You can use the macro giving with your compilator ( Fargo2,
DoorsOS, Teos...), but it takes quite a lot of memory.

That's why Api92 provides a function, that you should use
for size optimization : it gets the address of the handle
d0 and puts it in a0 :

	jsr	api92::DEREFd0a0


	V. Set/Get the APD value
	------------------------
The APD is the Auto Power Down. It is the timer after which
the calculator will automatically turn off.

* Set the APD:
	The function :
	jsr	api92::util_SetAPD

	Set the APD value to tha value of d0. Notice that
	d0 is in tick. To convert seconds in ticks, you 
	have to multiply your seconds by 20 approximatively.

* Get the APD :
	The function :
	jsr	api92::util_GetAPD

	get the current value of the APD. The returned value
	is put in d0 (in tick). To convert this value to 
	seconds,  you have to divide by 20 approximatively.