Path: utzoo!attcan!uunet!cbmvax!peter
From: peter@cbmvax.commodore.com (Peter Cherna)
Newsgroups: comp.sys.amiga
Subject: Re: Virtual CHIP Memory
Message-ID: <13903@cbmvax.commodore.com>
Date: 20 Aug 90 17:13:49 GMT
References: <3972@crash.cts.com>
Reply-To: peter@cbmvax (Peter Cherna)
Organization: Commodore, West Chester, PA
Lines: 29

In article <3972@crash.cts.com> seanc@pro-party.cts.com (Sean Cunningham) writes:
>In-Reply-To: message from Lee_Robert_Willis@cup.portal.com
>
>Did you know that this is already implemented?
> 
>WB2.0 has the "virtual desktop" feature allowing you to have a WB screen
>slightly greater than 32000 x 32000 pixels.  Do you think this screen is
>possible with only 2Mb of chipmem?  If so, go down and try it on your friendly
>neighborhood dealer's demo machine and see what happens...
> 
>All that extra screen memory is stored in fastmem, and then shifted to chipmem
>when you scroll the screen...you need something like 12Mb for the full screen
>bitmap...

The support for oversize scrollable screens in 2.0 still requires that
the whole screen is kept in chip memory.  The maximum size is determined
by your available chip memory.  If you like, you could make it 20000x400
or 640x20000, or 3000x3000, but 20000x20000 would require too much memory.

If you try to ask for a screen that's too big, you won't get it.

>  RealWorld: Sean Cunningham                   |   a sect. "

     Peter
--
     Peter Cherna, Software Engineer, Commodore-Amiga, Inc.
     {uunet|rutgers}!cbmvax!peter    peter@cbmvax.cbm.commodore.com
My opinions do not necessarily represent the opinions of my employer.
"Very strange... the window is broken on both sides."