The two programs included in this archive, DOORS and DOORS2 allow
a system with both a monochrome AND a graphics monitor to switch
between the two monitors "on the fly", without leaving software
that is running.

Either program becomes memory resident when it is run.

USAGE:

    DOORS  -  after it has been run, pressing the Alt - Right Shift
              keys together will switch the active monitors, and copy
              all text to the other monitor.

    DOORS2 -  pressing the Alt - Left Shift keys together will switch
              to the other monitor.  Pressing the Alt - Right Shift
              keys will copy the screen from the active monitor
              to the unused monitor, but will return the cursor
              back to its original screen.


I modified the original program because:

    - I prefer to work with the monochrome monitor because of the
      clarity of the text, but very often I would like text shown
      on the graphics monitor for reference (in effect, this lets
      me see 50 lines of information at a time);

    - Some programs (such as PC-WRITE) write directly to video memory,
      and switching monitors while using those programs only serves
      to confuse them.


Caveats:

    - If you are working with the graphics monitor, the routines will
      only work if you are in an 80-column text mode (y'all can't
      copy <or try to> graphics to the monochrome screen)

    - If you are working with the graphics monitor, you may lose
      information stored on pages other than the active display page.
      (The color/graphics card has enough memory to hold 4 80-column
      display "pages").  These routines work by copying information
      from the active page to the monochrome monitor (and back again,
      if you're using DOORS2), but they make no provision for saving
      the other display pages.  This will affect the operation of
      very few programs, however.  Very few programs make use of the
      additional text "pages" for the C/G adaptor card.  PC-WRITE
      is one program that does, however -- if you are using PC-WRITE
      on the graphics monitor, PC-WRITE stores its "help" screen
      information on the other video pages.  Using these routines
      with PC-WRITE will wipe out the "help" screens, but it will
      NOT affect file being edited or the operation of PC-WRITE.

    - The routines don't bother to check if they had been previously
      installed - so be careful, run 'em only once.

    - Use only ONE of the routines (either DOORS or DOORS2) -
      don't try to use both.

    - The modification to the installation code that I made requires
      DOS 2.0 or above -- the routines DON'T check the DOS version
      that is being used.

    - If switching FROM the monochrome monitor, the routines switch
      to the BW80 mode for the graphics monitor (see the source code
      for a note on changing the mode to color, if desired).


Information on the original DOORS.ASM program:
      
      ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
     ╔════════════════════════════════════════════════╗█
     ║               PCMagizine ASseMbler             ║█
     ║                                                ║█
     ║     The programs began their lives in          ║█
     ║     PC Magazine. A detailed description of     ║█
     ║     the program can be found in the issue      ║█
     ║     referenced below.                          ║█
     ║                                                ║█
     ╚════════════════════════════════════════════════╝▀

     DOORS.ASM     John Dickinson, "Try a Door, Not a Window"
               Vol. 4, No. 3 (February  5, 1985)
               Coordinating your color and monochrome
               displays



Modified January 1986.

Please let me know about any bugs/comments that you have via
Gene Plantz' IBBS, 312-882-4227.

                                                     Mike Pechnyo
                                                     ID1206