INT 29 - DOS Fast Character I/O (Undocumented 2.x+)

	AL = character to write

	returns nothing ???

	- used by DOS device drivers to output data to the screen if
	  bit 4 of the device attribute word is set
	- similar to INT 21,2 and INT 21,9 but much faster
	- simply calls the BIOS INT 10,E in DOS versions 2.x and 3.x
	- advances the cursor after character output