entire character set to use. In GR.1 and GR.2, you can use only one half
of the set at a time. You can't POKE it with 225 because the number
POKEd must be evenly divisible by two.

The characters stored here aren't in ATASCII order; they have their own
internal order for storage. The order of the characters is listed on page
55 of your BASIC Reference Manual.

Here's an example of how a letter (A) is stored in ROM. Each line
represents a byte. The decimal values are those you'd find if you
PEEKed the eight locations where "A" is stored (starting at 57608;
$E108):

     Bit   76543210   Decimal
                                +--------+
           00000000       0     |        |
           00011000      24     |   ##   |
           00111100      60     |  ####  |
           01100110     102     | ##  ## |
           01100110     102     | ##  ## |
           01111110     126     | ###### |
           01100110     102     | ##  ## |
           00000000       0     |        |
                                +--------+

     When you create your own character sets (or alter the Atari set
     when you move it to RAM -- see location 756; $2F4 for a routine
     to do this), you do a "bit-map" for each character as in the
     example above. It could as easily be a spaceship, a Hebrew
     letter, an APL character, or a face. Chris Crawford's game
     Eastern Front 1941 (APX) shows excellent use of an altered
     character set to create his large map of Russia, plus the symbols
     for the armies.

     Here's an example of using the bit-mapping of the character set
     to provide text in GRAPHICS 8:

     1  GRAPHICS 8
     5  DLIST = PEEK(560) + PEEK(561)*256
     6  LOBYTE = DLIST+4: HIBYTE = DLIST +
        5
     7  REAL = PEEK(LOBYTE) + PEEK(HIBYTE)
       *256: SCREEN = REAL: TV = SCREEN
     10  CHBASE = 57344
     20  DIM A$(128),BYTE(128),WANT(128)
     27  PRINT "INPUT A 40 CHARACTER STRIN
        G:"
     30  INPUT A$
     35  TIME = TIME + 1
     40  FOR LOOK = 1 TO LEN(A$)
     50  BYTE(LOOK) = ASC(A$(LOOK,LOOK))