VESA questions

[Lionel Pinkhard <lionelp@worldonline.co.za>]

Hey guys/gals,

I'm having some trouble with VESA bank switching, I have a copy of the
VESA specification with me, and it shows the following:

	AH = 4Fh	Super VGA support
	AL = 05h	Super VGA video memory window control
	BH = 00h	Select Super VGA video memory window
	BL = Window number
		0 = Window A
		1 = Window B
	DX = Window position in memory
	     (in window granularity units)

Okay, now my question is: What do I put in BL and DX? How do I calculate
the values? I'm using 640x480x256, mode 101h. Can somebody help me out
please? A simple pixel plotting routine would also be really appreciated,
since I'm just starting out with this stuff, I have tried before, but
everything's been a failure, but now I'm determined to make it work :-).

Ciao,

Lionel

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