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From: hentosh@amethyst.bucknell.EDU
Newsgroups: comp.sys.apple
Subject: Re:  double-hires page flipping
Message-ID: <8903220428.AA05597@amethyst>
Date: 22 Mar 89 04:28:07 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 35

>
>I have _not_ tried this, but I think the deal is that PAGE1 and PAGE2
>($C054 and $C055) will flip double-hires pages iff (if and only if)
>80STORE is turned off.  Once you've flipped to the page you want to
>show, you can turn 80STORE back on, at which time PAGE1 and PAGE2
>determine whether you're reading/writing main or auxiliary memory.
>
> --David A. Lyons              bitnet: awcttypa@uiamvs
>   DAL Systems                 CompuServe:  72177,3233
>   P.O. Box 287                GEnie mail:    D.LYONS2
>   North Liberty, IA 52317     AppleLinkPE: Dave Lyons
>

I have tried this and could not get is to display page two (which
should be from $4000 to $5FFF like it says on all the memory maps
in the IIGS Hardware Manual). I also to a look at Apple IIe technote #3
which talks about double Hi-Res and how to access both pages. (It says
to do the same thing as above).  But while reading the IIgs Hardware
Reference (p71 (middle of page) I noticed for the first time this:
"All of the display modes execpt 80-column text mode and Double Hi-Res and
Super Hi-Res graphic modes can use either of 2 display pages."
So which is right?  The rest of the book shows TWO pages for double
hi-res in all the figures and tables, and the IIe technote describes
how to access the second page, but I can't get it. So is there another
soft switch that needs setting? Or is this an incompatablility between
the two machines.... HELP!

        Thanks again,
                Bob

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