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From: ron@druhi.ATT.COM (TannerR)
Newsgroups: comp.sys.ibm.pc
Subject: Help: Display pages on PC
Message-ID: <1991@druhi.ATT.COM>
Date: Thu, 25-Jun-87 09:55:25 EDT
Article-I.D.: druhi.1991
Posted: Thu Jun 25 09:55:25 1987
Date-Received: Sat, 27-Jun-87 02:06:08 EDT
Distribution: comp
Organization: AT&T, Denver, CO
Lines: 36


I am trying to write on an invisible page and then flip to that page
to give the illusion of instant screen change.  The problem is that
I cannot get my system to write to another page without displaying
it.  I do the following:

  I am using the MSC 3.0 int86 function.
  To get the cpu and crt display pages I do
       
          inregs.h.ah = 5;
          inregs.h.al = 128;
          int86(0x10,&inregs,&outregs);
          cpu = inregs.h.bl;
          crt = inregs.h.bh;
          
  But I don't get pages, I get bigger numbers.  Then to change the
  cpu page I do:
  
          inregs.h.ah = 5;
          inregs.h.al = 129;
          inregs.h.bl = 1;
          int86(0x10,&inregs,&outregs);

  Then I do some things on this page, but the page is being
  displayed on the screen.  I know it is on a different page because
  changing the active page between 0 and 1 will show different
  screens.  The problem is that I see the writing to page 1 when I
  want it to be invisible.
  

Help?!


Thanks in advance,
  Ron Tanner