Re: Byte structure of Lo res

["Smohn Jith" <robwiles@optonline.net>]

"John B. Matthews" <nospam@nospam.com> wrote in message 
nospam-84329E.22411412092005@news-rdr-03.ohiordc.rr.com">news:nospam-84329E.22411412092005@news-rdr-03.ohiordc.rr.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/

Unfortunately I don't know how the text is, wish I had a //e technical 
reference.  So a nibble is the color part?  0-15?  It starts at $0400 right? 
Are there two screens?  With the other at $0800?  Is it scrambled like 
hi-res?