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Atari XL - Page 126

Atari XL
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116
The
Ateri
XL
Handbook
o
1
2
Memory
3
Location:
4
5
6
7
Bit:
765432 10
The
Character
Grid
foreground
colour;
if
the
bi t is
set
to 0
the
pixel
remains
in
the
background
colour.
In
normal
use,
the
character
definitions
are
held
in
2K
of
read
-only
memory
(ROM),
beginning
at
the
location
determined
by
the
contents
of
location
756.
The
start
address
of
the
character
set
ROM
is
obtained
by
multiplying
the
contents
of
location
756
by
256.
There
are
actually
two
sets
of
128
characters,
the
first
set
including
punctuation
and
maths
symbols,
numbers
and
letters
and
graphics
characters.
The
second
set
is
a copy of
the
first
except
that
the
29
graphics
symbols
(normally
obtained
by
holding
down
the
CONTROL
key
and
pressing
a
key)
are
replaced
by
a
European
character
set,
which
contains
characters
like
the
£
sign.
To
switch
between
the
two
character
sets
use
the
command:
POKE
756,204
and
to
switch
back:
POKE
756,224

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