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Atari 400 - Page 281

Atari 400
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Atari
Graphics & Sound
279
Graphics modes 3, 5, and 7
normally
have split screen displays.
However,
the
display can be changed
from
split-screen
to
full
screen by
adding
16
to
the
graphic
mode
number
when
the
GRAPHICS statement
is
executed.
Graphics modes
3,
5,
and 7 each have 4
color
registers available
(registers
0,
1, 2, and
4).
Color
register4
controls
the
background
and
border
colors. The
foreground
colors are
controlled
by
registers
0,1,
or
2.
Color
register 3
is
unused in graphics
modes3,
5,
and
7.
In graphics
mode
3,
the split-screen
is
divided
into
20
rows
of
40
columns
each. In graphics
mode
5,
the
screen
is
divided
into
40
rows
of
80
columns
each. In graphics
mode
7,
the screen
is
divided
into
80
rows
of
160
columns
each.
Table 9-8. Summary
of
Graphics
Modes
Features
No.
of
Rows
Mode
No.
of
No.
of
RAM
No.
Columns
Split Screen
Full Screen
Color
Registers
Required
0
40
24
1
993
1
20 20
24 5
513
2
20
10
12 5
2
61
3 40 20
24
4 273
4
80 40
48
2
537
5
80
40
48
4
1017
6
160
80
96
2
2025
7 160
80
96
4
3945
8
320 160
192 1 7900
Graphics modes 4 and 6 have
one
foreground
color
register and
one
background
and
border
color
register. Even
though
modes
4 and 6 have
the
same
number
of
rows and
columns
as
modes 5
and
7 respectively,
less
RAM
is
required
for
modes
4 and
6.

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