APPENDIX D

SCREEN DISPLAY CODES - 40 Columns


The following chart lists all of the characters built into the Commodore
screen character sets. It shows which numbers should be POKED into screen
memory (locations 1024-2023) to get a desired character on the 40-column
screen (Remember, to set color memory, use locations 55296 to 56295). Also
shown is which character corresponds to a number PEEKed from the screen.

Two character sets are available. Both are available simultaneously in 80-
column mode, but only is available at a time on the 40-column screen. The
sets are switched by holding down the {shift} and {C=} (Commodore) keys
simultaneously.

From BASIC, PRINT CHR$(142) will switch to upper case/graphics mode and
PRINT CHR$(14) will switch to upper/lower case mode.

Any number on the chart may also be displayed in REVERSE. The reverse
character code may be obtained by adding 128 to the values shown.


SET 1   SET 2   POKE  |  SET 1   SET 2   POKE  |  SET 1   SET 2   POKE
----------------------+------------------------+-----------------------
                      |                        |
  @               0   |    C       c       3   |    F       f       6
  A       a       1   |    D       d       4   |    G       g       7
  B       b       2   |    E       e       5   |    H       h       8
----------------------+------------------------+-----------------------
SET 1   SET 2   POKE  |  SET 1   SET 2   POKE  |  SET 1   SET 2   POKE
----------------------+------------------------+-----------------------
  I       i       9   |    %              37   |            A      65
  J       j      10   |    &              38   |            B      66
  K       k      11   |    '              39   |            C      67
  L       l      12   |    (              40   |            D      68
  M       m      13   |    )              41   |            E      69
  N       n      14   |    *              42   |            F      70
  O       o      15   |    +              43   |            G      71
  P       p      16   |    ,              44   |            H      72
  Q       q      17   |    -              45   |            I      73
  R       r      18   |    .              46   |            J      74
  S       s      19   |    /              47   |            K      75
  T       t      20   |    0              48   |            L      76
  U       u      21   |    1              49   |            M      77
  V       v      22   |    2              50   |            N      78
  W       w      23   |    3              51   |            O      79
  X       x      24   |    4              52   |            P      80
  Y       y      25   |    5              53   |            Q      81
  Z       z      26   |    6              54   |            R      82
  [              27   |    7              55   |            S      83
pound            28   |    8              56   |            T      84
  ]              29   |    9              57   |            U      85
  ^              30   |    :              58   |            V      86
  <-             31   |    ;              59   |            W      87
SPACE            32   |    <              60   |            X      88
  !              33   |    =              61   |            Y      89
  "              34   |    >              62   |            Z      90
  #              35   |    ?              63   |                   91
  $              36   |                   64   |                   92
----------------------+------------------------+-----------------------
SET 1   SET 2   POKE  |  SET 1   SET 2   POKE  |  SET 1   SET 2   POKE
----------------------+------------------------+-----------------------
                      |                        |
                 93   |                  105   |                  117
                 94   |                  106   |                  118
                 95   |                  107   |                  119
SPACE            96   |                  108   |                  120
                 97   |                  109   |                  121
                 98   |                  110   |                  122
                 99   |                  111   |                  123
                100   |                  112   |                  124
                101   |                  113   |                  125
                102   |                  114   |                  126
                103   |                  115   |                  127
                104   |                  116   |
----------------------+------------------------+-----------------------

      Codes from 128-255 are reversed images of codes 0-127.