Apple IIe - Page 302

302
Apple
lie
Users
Handbook
CLREOL
($FC9C/ 64668)
A=??
X =
--
Y
=
??
CLREOL clears
the
text
line
in
which
the
cursor
resides,
from
the
cursor
position
to
the
end
of
line
.
CLREOP
($FC42/64578)
A=??
X =
--
Y =
??
CLREOP clears
the
text
window
from
the
current
cursor
position
to
the
bottom
of
the
screen.
COUT
($FDED/65005)
A=?? X
=??
Y
=??
COUT
calls
the
character
output
subroutine
.
The
character
output
subroutine
(usually COUT1) must have its starting
ad-
dress
in
locations
($36-$37).
The
character
to
be
output
should
be
in
the
accumulator
.
COUT1
($FDF0/65008)
A =
??
X =
??
Y =
??
COUT1
displays
the
character
to
be
output
(accumulator
)
on
the
screen.
The
character
will
be
displayed
at
the
current
cursor
position.
Afterwards
,
the
cursor
position
will
be
advanced.
COUT1
takes care
of
control
characters,
return
, li
nefeed
,
and
bell
.
CROUT
($FD8E/64910)
A=
--
X =
--
Y =
--
CROUT
outputs
a carriage
return
($00)
to
the
current
output
device.
GETLN
($FD6A/64874)
A=
--
X
=length
of
line
Y
=
--
GETLN accepts an
entire
string
of
characters,
storing
them
in
the
input
buffer
($200).
The
prompting
character
should
be
stored
in
location
$33.
The
X-register
will
contain
the
length
of
the
string
upon
return
from
the
subroutine.
GETLNZ
($FD67 /64871)
A=
--
X
=
length
of
input
Y =
--
GETLNZ
sends a carriage
return
to
the
output
device
, and
then
calls
GETLN.