Jet Set Willy Memory Usage
                      ==========================

 4000  +--------+     6000  +--------+     7000  +--------+
       | Screen |           |        |           |        |
       |  Top   |           |        |           |        |
       | Third  |           | Screen |           | Screen |
 4800  +--------+     6800  + Buffer +     7800  + Buffer +
       | Screen |           |   2    |           |   1    |
       | Middle |           |        |           |        |
       | Third  |           |        |           |        |
 5000  +--------+     7000  +--------+     8000  +--------+
       | Screen |
       | Bottom |
       | Third  |
 5800  +--------+     5C00  +--------+     5E00  +--------+
       | ATTRs  |           |        |           |        |
       |  Top   |           |        |           |        |
       | Third  |           |  ATTR  |           |  ATTR  |
 5900  +--------+     5D00  + Buffer +     5F00  + Buffer +
       | ATTRs  |           |   2    |           |   1    |
       | Middle |           |        |           |        |
       | Third  |           |        |           |        |
 5A00  +--------+     5E00  +--------+     6000  +--------+
       | ATTRs  |
       | Bottom |
       | Third  |
 5B00  +--------+
       | Stack  |
 5C00  +--------+


   8000 +------------------+      9800 +------------------+
        |      Room        |           | ATTRs for Startup|
        |     Buffer       |           |Screen, and bottom|
   8100 +------------------+      9A00 +third of gameplay +
        |    Guardian      |           |     Screen       |
        |     Buffer       |      9B00 +------------------+
   8200 +------------------+           |  Number Sprites  |
        |   Pixel-line     |      9B80 +------------------+
        |  look-up table   |           |    ATTRs for     |
   8300 +------------------+           | password screen  |
        |      Rope        |      9C00 +------------------+
        |    Structure     |           |      unused      |
        |      Data        |      9C40 +------------------+
   8400 +------------------+           |   Foot/Barrel    |
        |     Startup      |      9C80 +------------------+
        |      Code        |           |      Maria       |
   8431 +------------------+      9D00 +------------------+
        |    Triangle      |           |      Willy       |
        |      Data        |      9E00 +------------------+
   8454 +------------------+           |  Password codes  |
        |      Text        |      9EB3 +------------------+
   85CB +------------------+           |      unused      |
        |    Variables     |      9F00 +------------------+
   85E5 +------------------+           |      unused      |
        |    Teleport      |      A000 +------------------+
        |    Password      |           |   Guardian Data  |
   85FB +------------------+      A3FF +------------------+
        |    Moonlight     |           |   Object Table   |
        |     Sonata       |      A600 +------------------+
   865F +------------------+           |      Toilet      |
        |    If I were     |      A680 +------------------+
        |   a Rich Man     |           |      unused      |
   869F +------------------+      A700 +------------------+
        |      Code        |           |      unused      |
   96F4 +------------------+      AB00 +------------------+
        |   Unused Code    |           |      Sprites     |
   9718 +------------------+      C000 +------------------+
        |   Spare Space    |           |      Rooms       |
   9800 +------------------+      FFFF +------------------+