gfxmem.c  - graphically display available memory.  Quick program
     that's a freebie.  Give it to anyone you please, just don't sell it.

       Version 0.0 - initial version, released on INFO-AMIGA.
       Version 0.1 - added numeric indication of available and used memory
                     in bar graphs.
       Version 0.2 - added condition compilation for timer.device code.  If
                     I can figure out how to make it create timer signals,
                     then I can define USE_TIMER for much more prompt
                     response to window sizing attempts.  Oh well.
       Version 0.3 - removed conditional compilation for timer.device
                     code.  We now use the timer, and all seems well.
       Version 0.4 - calculate character data placement according to
                     display preferences.  Check for updated preferences
                     while running.
    Version 0.5 - don't display fast memory if none exists.  Handle
             Lattice C 3.03 in V1.1 update kit that insists on
             creating a window for stdin, stdout and stderr with-
             out asking.  Foo!
         source size = 19,728 bytes
         running size= 32,088 bytes

   Version A.6 - converted to assembly by Darrel Schnieder.
         source size =  1,576
         running size=  9,984
      Changes:
          1. Window now SMART_REFRESH. This simplifies what
           messages need to be responded to. The only time
           the window needs to be refreshed is if the window
           is resized.
          2. Used RMBTRAP so that the window wouldn't get
           menu messages.
          3. Got rid of the SetWindowTitles message that was
           written when the window became active.
          4. HorizSpace = AvailWidth>>5 in place of
            HorizSpace = AvailWidth/20
           This has the effect of the margin being smaller.
          5. The loop that sets ChipMax & FreeMax is only
           called once. This means that if the user adds
           memory to the system while running gfxmem that
           memory will not show up.
            Also in the same loop comparisons are made to
           MEMF_FAST+1 and MEMF_CHIP+1 rather than
           MEMF_FAST   and MEMF_CHIP as the original program
                  did.
           This works on my system and I don't understand the
           need for the difference.
          6. The redraw subroutine uses FORBID/PERMIT so that
           once it starts tasks of a higher priority will not
           preempt it.
          8. The numerical sizes of the memory are displayed
           to the far left and right rather than the middle.
           I did this so that it would be easier to use the
           middle to display some more info.
           I also made the text colors opposite.
          9. When the numerical amount is printed it only
           prints the actual number with no preceeding
           blank spaces.
           This means it is more likely that the number can
           be printed since it takes up less space.
         10. Used SetDrMd to set the mode to JAM1 and thus
           need never worry about setting the background
           pen. This got rid of 6 calls to SetBPen.
         11. Consolidated the natural parrallelism between
           ChipMem and FastMem code in redraw. This roughly
           cut the size of redraw in half.
         12. Will now run with a stack as small as 1600 bytes.
         13. Displays graphically most recent change.
           This is done by a bar in the middle.

          

                 Copyright (C) 1985,
                 Louis A. Mamakos
                 Software & Stuff