I made some changes to the docs for the video controller.  The sample
program had a problem where a moving image would show tearing in the
first scanline.  The problem was that the first scanline was being
fetched way too far in advance.  So what we did was change the order
of things so that it's fetched only one scanline in advance (which is
already the same for all other scanlines).

Also, while I was in there, I noticed an off-by-one, where one of the
subroutines was going to take one cycle too long.  Monitors won't like
that.  Could someone have a look and double-check me on the timing?

I'm going to go change the asm code to match, and I think I'll also
tinker around with the macros, because I think the vp_width and the
fb_width are being treated as different units.


--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Favorite book:  The Design of Everyday Things, Donald A. Norman, ISBN
0-465-06710-7
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