Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!tut.cis.ohio-state.edu!ucbvax!UIAMVS.BITNET!AWCTTYPA
From: AWCTTYPA@UIAMVS.BITNET ("David A. Lyons")
Newsgroups: comp.sys.apple
Subject: double-hires page flipping
Message-ID: <8903210732.aa17770@SMOKE.BRL.MIL>
Date: 21 Mar 89 12:33:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 30

>Date:         Tue, 21 Mar 89 07:34:09 GMT
>From:         Matt Deatherage <mattd@APPLE.COM>
>Subject:      Re: Page Flipping.
>
> [...]
>Peter Baum (the man who discovered Double Hi-Res in the first place, and
>in the second) told me once that you can access DHGR page two, but you have
>to be sure the 80-column FIRMWARE is off.
>
>Unfortunately, that's all I remember, and I haven't had time to go mucking
>about with it lately.  But it's a start.

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.

>Matt Deatherage, Apple Computer, Inc.
>[...]
>Usenet:  mattd@apple.com

Matt--I'm about 89% sure that "mattd@apple.com" is an Internet
address and not a Usenet address.  But then I don't have much of an
idea what Usenet really is.

 --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