My vga notes

1. vgablt4.asm 
	has a routine "boxes" to draw a row of boxes
	and a routine "checker" to down an array of boxes.

	-- the demo is in mode 10h, which is 640x350.
		Each box is 64x35, and we can get
		a 10x10 array boxes.
	-- if you draw a horizontal row, and it exceeds
		the 640 pixel limit, it just wraps
		around horizontally.
	-- I am not sure if you exit the 350 limit, it
		will wrap around vertically.
	-- you can set the 7th bit of AL when you
		set new mode: this avoids the
		clearing of the old image on the page.
		
