Basic
SCREEN
(row,
column,[number])
Returns the ASCII code for the character at the specified row and
column.
Row
is an integer in the range
1
to
25.
Column
is
an integer
in the range
1
to
40
or
1
to
80,
depending on the screen width.
If
number
is specified and is non-zero, BASIC returns the color
number in the range
1
to
16
instead of the ASCII code of the
character.
A=
SCREEN(20,ZQ)
PRINT SCREEN
(10,1f18
1
SCREEN
[mode][,[burst][,[active
page]
[display page11 [,erasell
Sets the screen attributes to be used by all other graphics statements.
Mode
is an integer in the range
0
to
6.
Burst
enables or disables color. In Screen Mode
0
(text mode), set
burst
to
0
to disable color or
1
to enable color. In Screen Modes
1
and
4,
set
burst
to
0
to enable color or
1
to disable color.
Burst
has
no effect in Screen Modes
3,
5,
and
6
where color is always enabled
or in Screen Mode
2,
which
is
black and white.
Active page
selects the video page to which BASIC will write. All
output statements to the screen go to the selected
active page.
Default
=
Page
0
or current active page.
Display page
selects the video page for BASIC to display. Default
=
active page.
Erase
tells BASIC how much video memory to erase.
Erase
can be
one of the following:
Do not erase video memory, even
if
the screen mode
changes.
Erase the union of the new page and old page if
mode
or
burst
change. Default
=
1.
Erase all video memory
if
mode
or
burst
changes.
0
1
2
SCREEN
0,0
SCREEN
2
62
Tandy
1000
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