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From: fitzpatrick@vaxine.DEC
Newsgroups: net.micro.apple
Subject: Re: Double Hi-Resolution on the II
Message-ID: <604@decwrl.DEC.COM>
Date: Tue, 21-Jan-86 12:20:10 EST
Article-I.D.: decwrl.604
Posted: Tue Jan 21 12:20:10 1986
Date-Received: Thu, 23-Jan-86 20:57:22 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 45


   Just to reiterate what's already been said by Vincent Foster, to use 
   double Hi-Res you need:
   
   o    Apple //e with revision 'B' motherboard.
   
   o    Apple Extended 80 column card with a jumper (supplied with card) 
        installed between the molex connectors.
   
   If you can find them, the following issues of Softalk had articles on 
   double Hi-Res:
   
   
        "Hi-Res Double Play" 
        by Don Worth
        July, 1983
   
        -A good overview of how the double hi-res display works and how 
        it differs from standard hi-res.  Includes example Applesoft 
        programs to put the concepts to use.
   
   
        "Applesoft Brushes for Double Hires" 
        by Peter Baum and Larry Roddenberry
        September, 1983
   
        -A more in-depth discussion of making use of DHR.  Included is an 
        assembly language listing to implement DHR versions of HPLOT 
        graphics commands from Applesoft using the ampersand vector.  (A 
        friend of mine is customizing these routines for use in a NAPLPS 
        implementation for the //.)
   
   
   Beagle Brothers puts out a disk that does similar things with DHR, the 
   name of it escapes me at the moment.  Nice thing is that BB never copy 
   protect or lock up their disks, so you can look at every file to see 
   how it ticks.
   
    
   Dave FitzPatrick
 
        ...decvax!decwrl!dec-rhea!dec-vaxine!fitzpatrick
 
        on BIX: B-mail to dave.f
                        (co-moderator, leisure conference)