Re: Switching to Double Hi-Res (DHGR) within a program

[BLuRry <brendan.robert@gmail.com>]

On Oct 26, 4:11 am, Bill Buckels <bbuck...@escape.ca> wrote:
> On Oct 25, 2:34 pm, vectorthom <greg.rossi...@gmail.com> wrote:
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> > Hello all,
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> > I'm trying to learn how to use Double Hi-Res graphics on the Apple
> > II.  I've recently acquired an Apple IIe to replace one my family sold
> > years ago and am reliving my '80s childhood through old floppy disks
> > that I still have on-hand.  I don't remember even knowing about double
> > hi-res graphics back then, but I'd like to start experimenting with it
> > now.  I have Broderbund's Dazzledraw (a DHGR program) and a bunch of
> > homemade drawings saved to disk.  I have a Rev. B Apple IIe and an 80
> > col/64k expansion card, so I believe I have the machine capability to
> > display DHGR.  At the prompt, I know that entering "PR#3" will switch
> > me to 80 column mode, where all the text gets visibly thinner.  Is
> > this essentially DHGR mode or is there more to it than that?
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> > My main question however is this:  how do I switch to DHGR mode once
> > I'm within a program?  As said, I can switch to 80 column mode when
> > I'm at the prompt, but when I reboot to start loading Dazzledraw for
> > example, it hops back to 40 column mode.  I don't see a way to switch
> > back from within the program.  I'm curious to know if I'm viewing my
> > created images at their best or if they would look better in 80 column
> > mode. Is there a relatively easy way to toggle back and forth between
> > video modes?
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> > Thanks,
> > Greg R
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> You may enjoy reading this page...
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> http://www.appleoldies.ca/azgraphics33/index.htm
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> There are some conversion utilities and stuff here as well... this may
> not answer your questions and may create more questions...
>
> Bill

I can also wrap a command-line handler around the conversion work I've
already done, but for the impatient the hard work is already done in
the Apple Game Server 3 codebase.  The only converter I'm not totally
happy with is the HGR conversion, as it doesn't properly account for
hi-bit collision.  Still, it does okay with pre-normalized pictures of
low complexity.  Either way, you can make some good logo screens with
little effort.  Not that I dislike dazzle draw, but man do I get more
done in the Gimp.  ;-)

-B