APPENDIX
Sound
and
Display
Characters
and
Codes
One
of
the more powerful functions
of
the VIC
20
is
its display and
sound generation capability. The tables in this appendix cover all
of
the VIC
character codes, screen
POKE
values, sound register equivalents, and color
values.
Table E-l covers all of the characters and functions that are displayed
using the C:fIR$ instruction. In many instances, the use
of
the CHR$ function
is
optional; however, some functions, such as RETURN and
RUN/STOP,
are not programmable with the
PRINT
function. To program using these
functions you will need to use the CHR$ function and the codes in this table.
The codes used in the CHR$ instruction are not the same as those used
in the POKE-to-screen commands. The codes shown in Table E-2 are listed
in the same order as the characters in memory. Notice that all
of
the control
characters are omitted from this list. This
is
because there
is
no display code
for them; control codes use the codes of standard reverse characters (for
example, reverse-heart for
CLR/
HOME).
Like the table for character POKEs, the color table in Table E-3
indicates the number associated with each screen and border color
on
the
VIC. These values are
POKEd
into location 36879 to produce display color
changes. The circled numbers produce screens with fields and borders
of
the
same color.
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