Advanced Atari
BASIC
85
for
EOL).
Tab Function
Tabbing
on
the Atari
is
very similar
to
tabbing
on
a
normal
typewriter.
Tabs are
pr
ese
t along the
entire
length
of
a logical
line
. The first tab
position
is
the left margin
(column
2),
followed
by
columns
7,
15
,
23
, and every
eighth
column
to
the
end
of
the
logical line.
Tabs
work
much like commas
do
when
they
are used
as
formatting
characters in PRINT statements.
However
, tabs and
commas
function
completely
separately. The
column
positions
set
up
by commas have
no
effect on the tab positions, and vice
versa.
In the
immediate
mode
, the tab key
is
used
to
move
the cursor
to
the next tab position.
Wh
en the tab key
is
pressed, the cursor
will
move
to
the
next tab
po
s
ition
without
any
of
the
characters
it
passes
over
being erased.
If
the
tab key
is
pressed
with
the
cursor
at the
last tab stop, the cursor
will
move
to
the start
of
the
next
logical line.
In
the
program
mode
, the cursor
is
tabbed by using
the
ASCII
code
for
tab, 127. This can
either
be accomplished by using
the
CHR$
function
or
by using
ESC
/ TAB
within
a string.
In
addition
to
the
pre-defined
tab stops already
mentioned
,
more
tab stops can be set in any
column
desired. In
the
immediate
mode
, a tab stop can be set by
moving
to
the desired
column
and pressing the SHIFT-TAB keys.
Tab stops can
also be set
with
the PRINT statement.
The
PRINT
statement must display a string
whi
ch cau
se
s the cursor
to
move
to the desired position. The tab
set
character, CHR$(159)
or
ESC
/ SHIFT-TAB, must
then
occur
in
the
string. For example, in
the
following
statement,
100
PRINT
"JOHN";
CHR$(159)
a tab stop
is
set in the
fourth
column
.
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