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Atari 400 User Manual

Atari 400
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156 User's
Handbook
to
the
Atari 400/
800
Computers
The previous
example
displays the
current
value
for
the
right
margin
of
the
screen. The
default
value
is
39
.
PLOT (PL.)
The PLOT statement
is
used
to
display a character
or
picture
element
on
the
display.
CONFIGURATION
PLOT a,b
The arguments
of
a PLOT statement
determine
the
position
on
the
screen
where
the character
or
picture
element
appears. The
first
argument
(a)
indicates
the
column,
and
the
second
argument
(b) indicates the row. The graphics
mode
specified
determines
the
number
of
rows and
columns
of
the display. If
either
of
the
arguments
is
not
an
integer,
it
is
rounded
off.
If
either
argument
is
negative
or
greater than
the
dimension
of
the
screen an
error
resu
Its.
In graphics
mode
0,
the
COLOR
statement indicates
the
character that
will
appear at the next PLOT location.
However,
the
COLOR
statement
has
nothing
to
do
with
the
color
of
the
character. Table 9-7 indicates the
COLOR
value
for
each
character.
In graphics modes 1 and
2,
the
COLOR
statement indicates
the
character and
location
register used in
the
next PLOT
location
.
Table
9-4 indicates
the
COLOR
value
for
each character in each
color
register. In graphics modes 1
and
2,
color
registers are
available
for
each character.
As
a result, each character can be
displayed in any
of
4 colors.
In
graphics modes 3
through
8, the PLOT statement
illuminatesa
picture
element
at
the
screen
position
indicated
by the
arguments
of
the
PLOT statement. The
dimensions
of
the
display
depend
on
the
graphics mode. The
number
of
possible colors
also
depends on
the
graphics mode.

Table of Contents

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Atari 400 Specifications

General IconGeneral
ManufacturerAtari
Model400
TypeHome Computer
Release Year1979
CPUMOS Technology 6502
CPU Speed1.79 MHz
ROM10 KB
Operating SystemAtari OS
KeyboardMembrane keyboard
RAM8 KB (expandable to 48 KB)
GraphicsANTIC and GTIA chips
Sound4 channels
DisplayRF output for connection to TV
StorageOptional cassette tape drive or floppy disk drive
PortsCartridge
Display Resolution320x192 (16 colors)

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