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From: ranger@ecsvax.UUCP (Rick N. Fincher)
Newsgroups: comp.sys.apple
Subject: Re: // screen memory question
Message-ID: <2429@ecsvax.UUCP>
Date: Thu, 4-Dec-86 09:56:38 EST
Article-I.D.: ecsvax.2429
Posted: Thu Dec  4 09:56:38 1986
Date-Received: Fri, 5-Dec-86 10:38:12 EST
References: <18800002@uiucme>
Organization: UNC Educational Computing Service
Lines: 27
Summary: Apple //e 80 column screen locations

In article <18800002@uiucme>, matthew@uiucme.UUCP writes:
> 
> 
> 
> How do you create windows on the //e (or //c) in 80 column mode?  What I would
> like to do is save the area that I want to write the window to, plop the
> window there and when I am done with the window, replace the window with
> the original stuff.  I have no trouble doing this on my pc because I know 
> where screen memory starts.  I can't find reference to this in any of the
> manuals that I have.

The 80 column screen resides in two separate banks of 1memory of 1K
each.  The mapping scheme is rather bizarre, so what you describe is not
simple.  However, Apple has a toolkit that will make this job simpler.
It is the mousetext toolkit available from developer support.  It will
let you create windows on an Apple //e with the new Roms and on the //c.
You can use the kit from Basic with & commands or from Apple Pascal and
assembler.  If you don't want to go that route, I would suggest getting
a book like "Inside the Apple //e" by Gary Little.  He goes into depth
about how the 80 column screen is mapped to the memory.  He doesn't  
have anything about windows, but it is good as a reference.  You might
also check Nibble magazine.  A few months back they published a simple
window manager program.  You can get this program on disk from them if you liif         
you like, the address is in the magazine.

Rick Fincher
ranger@ecsvax