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From: Phil_Bowers.henr801E@XEROX.COM
Newsgroups: comp.sys.apple
Subject: Page Flipping.
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Date: 22 Mar 89 17:59:11 GMT
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I have noticed that the Double Hi-Res screen has two pages,
but I don't see a soft switch to flip between the two.
Does anyone know if Double Hi-Res page flipping is possible, and
if it is how does one go about implementing it.

                Thanks,
                        Bob


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  I have just come onto the mailing service and I and not sure what type
Apple (breed, whatever) you have. I have an Apple II+. There are two Hi-Res
screen buffers; one from $2000 to $3FFF (page 1)and the second from $4000
to $5FFF(page 2). 
   I have some code in both BASIC and Assembler that allows you to write to
one page while looking at the other, and then flip to the one just written
(via a peek, or an Assembler load instruction). To set up  variuos sreen
combinations, all graphics or graphics/text, only four soft switches  are
used, and only one is needed to READ from in order to flip the screens but
I do not know them off-hand) If this would be of help, let know and I will
figure how to get the info to you with the least fat-finger errors. sent
your mail note to:      
                       Phil Bowers:henr801e:xerox