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

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

On Oct 25, 9:40 pm, "Charlie" <charlieD...@verEYEzon.net> wrote:
> "vectorthom" <greg.rossi...@gmail.com> wrote in message
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> ebe3e48f-7c50-4a08-a2dc-5c9533db1d89@j18g2000yqd.googlegroups.com">news:ebe3e48f-7c50-4a08-a2dc-5c9533db1d89@j18g2000yqd.googlegroups.com...
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> > Hello all,
>
> > 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?
>
> > 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?
>
> > Thanks,
> > Greg R
>
> To turn on Double Hi-Res (DHR) from an Applesoft BASIC program:
>
> 10 X = PEEK(49239) : REM TURNS ON HI-RES
> 20 X = PEEK(49232) : REM TURNS ON GRAPHICS
> 30 X = PEEK(49246) : REM TURNS ON DOUBLE HI-RES
> 40 X = PEEK(49235) : REM TURNS ON MIXED MODE (OPTIONAL)
> 50 POKE 49165,0 : REM TURNS ON 80 COLUMN MODE
>
> This is pretty much from Apple II Tech note #3.
>
> The locations that you peek or poke are called softswitches and
> there are ones to turn on/off the different video modes as well as
> other stuff.  You should get a list of all the softswitches.
> There's one at:
>
> http://www.textfiles.com/apple/
>
> Look for appswitc.app.
>
> Charlie

If you want something to extend beyond nostalgia of DHGR, you might
get a kick out of something not done back in the day.  :-)

https://sites.google.com/site/brendanrobert2/pseudo-colorexperiment