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

[lyricalnanoha@dosius.ath.cx (Steve Nickolas)]

vectorthom wrote:
> 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?

There's some pokes, and the //e firmware doesn't know about DHGR.  (Beagle
Graphics contains tools to handle DHGR like HGR)

DHGR mode is tied to 80-column mode, also.

> Is there a relatively easy way to toggle back and forth between
> video modes?

Well, there's ? CHR$(21); which kills the 80-column mode...

-uso.