Screen size memory requirements

  +------------+-------------+-------------+-------------+-------------+-------------+
  |            |                               Columns                               |
  |            +-------------+-------------+-------------+-------------+-------------+
  |            |    160px    |    320px    |    640px    |    960px    |   1280px    |
  | Rows  Colrs|   20chars   |   40chars   |   80chars   |  120chars   |  160chars   |
  +------------+-------------+-------------+-------------+-------------+-------------+
  |          2 |   5K  &1400 |  10K  &2800 |  20K  &5000 |  30K  &7800 |  40K  &A000 |
  |  256px   4 |  10K  &2800 |  20K  &5000 |  40K  &A000 |  60K  &F000 |  80K &14000 |
  | 32chars 16 |  20K  &5000 |  40K  &A000 |  80K &14000 | 120K &1E000 | 160K &28000 |
  |        256 |  40K  &A000 |  80K &14000 | 160K &28000 | 240K &3C000 | 320K &50000 |
  +------------+-------------+-------------+-------------+-------------+-------------+
  |          2 | 7.5K  &     |  15K  &3C00 |  30K  &7800 |  45K  &B400 |  60K  &F000 |
  |  384px   4 |  15K  &3C00 |  30K  &7800 |  60K  &F000 |  90K &16800 | 120K &1E000 |
  | 48chars 16 |  30K  &7800 |  60K  &F000 | 120K &1E000 | 180K &2D000 | 240K &3C000 |
  |        256 |  60K  &F000 | 120K &1E000 | 240K &3C000 | 360K &5A000 | 480K &78000 |
  +------------+-------------+-------------+-------------+-------------+-------------+
  |          2 |  10K  &2800 |  20K  &5000 |  40K  &A000 |  60K  &F000 |  80K &14000 |
  |  512px   4 |  20K  &5000 |  40K  &A000 |  80K &14000 | 120K &1E000 | 160K &28000 |
  | 64chars 16 |  40K  &A000 |  80K &14000 | 160K &28000 | 240K &3C000 | 320K &50000 |
  |        256 |  80K &14000 | 160K &28000 | 320K &50000 | 480K &78000 | 640K &A0000 |
  +------------+-------------+-------------+-------------+-------------+-------------+
  |          2 |  15K  &3C00 |  30K  &7800 |  60K  &F000 |  90K &16800 | 120K &1E000 |
  |  768px   4 |  30K  &7800 |  60K  &F000 | 120K &1E000 | 180K &2D000 | 240K &3C000 |
  | 96chars 16 |  60K  &F000 | 120K &1E000 | 240K &3C000 | 360K &5A000 | 480K &78000 |
  |        256 | 120K &1E000 | 240K &3C000 | 480K &78000 | 720K &B4000 | 960K &F0000 |
  +------------+-------------+-------------+-------------+-------------+-------------+
  |          2 |  20K  &5000 |  40K  &A000 |  80K &14000 | 120K &1E000 | 160K &28000 |
  | 1024px   4 |  40K  &A000 |  80K &14000 | 160K &28000 | 240K &3C000 | 320K &50000 |
  |128chars 16 |  80K &14000 | 160K &28000 | 320K &50000 | 480K &78000 | 640K &A0000 |
  |        256 | 160K &28000 | 320K &50000 | 640K &A0000 | 960K &F0000 |1280K &140000|
  +------------+-------------+-------------+-------------+-------------+-------------+