register value
7) use
The 7 as the second
number afler the SOUND
command—SOUND 1.7.30
Use
the following formula fo find the sound register values
lor frequen-
cies
other than those in the table:
SOUND REGISTER VALUE
-
1024-(111860
781/FREQUENCY)
Both
the table of sound register
values arid
the
above formula are lor
NTSC televisions
This
Is
the
television
standard
used
throughout the
United
States and all ol Canada
If
you
are in
a
country where PAL is
the
television standard,
you
should
use
the
following
formula to calcu-
late
new
sound register values for the entire
table
SOUND
REGISTER VALUE
=
1024—
(11T840.45/FREQUENCY)
174
APPENDIX
E
Screen Display
Codes
The following chart lists all ol the characters built into the Commodore
character
sets
It
shows which numbers should
be
POKEd Into screen
memory (locations
3072 to 4095) to gel a desired character (Remem-
ber
lo
set
color memory —2048
to 3071 ) Also shown is which char-
acter corresponds
to a
number PEEKed Irom
the screen
Two
character sets are available, but only
one set at a
time.
This
means
that you cannot have characiers from one set
on
the screen
at
the
same
lime
you have characters from the other
set displayed. The
sets are
switched
by holding down the
shift
and
O
keys
simultaneously.
From BASIC, PRINT
CHR$(142) will switch
to
upper-case/graphics
mode and PRINT
CHRS(14) switches to upper/iower-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
175
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