Re: Byte structure of Lo res

["John B. Matthews" <nospam@nospam.com>]

In article 
<Pine.LNX.4.62.0509122038240.22555@static-141-149-129-16.buff.east.veriz
on.net>,
 Lyrical Nanoha <LyricalNanoha@dosius.net> wrote:

> On Mon, 12 Sep 2005, Smohn Jith wrote:
> 
> > What's the byte structure of Lo-res screen?
> 
> Same as text, dividing the bytes into nibbles for top and bottom.
> 
> -uso.

In addition, each horizontal line is 40 contiguous bytes, but the lines 
are "scrambled" in the same way as the text screen's. Here's some sample 
code that uses a lookup table to convert a vertical index into a graphic 
base address:

<http://www.wright.edu/~john.matthews/apple2.html#lr>

-- 
John
jmatthews at wright dot edu
www dot wright dot edu/~john.matthews/