!IO
Operations Guide
Since this
mode
uses
up
to
64K
bytes
of
memory, make sure
the
ATI
Graphics Solution is
the
ONLY
video adapter
in
your
system before
using this mode. This will avoid video
memory
conflict.
132
x
25
Color
Text
Mode
One
page
of
text
is provided in this mode. Its address
is:
bSOOO
- b9fff
2. ATI GRAPHICS SOLUTION CONFIGURED IN MONOCHROME
GRAPHICS MODE
IBM
Monochrome
Mode
The
AT!
Graphics Solution allows 4 pages
of
text.
Their
addresses
are:
Page
0:
bOOOO
-
bOfff
Page I:
blOOO
-
blfff
Page
2:
b2000
- b2fff
Page
3:
b3000
- b3fff
Hercules
Graphics
Mode
In this mode, 2 pages are
provided
with
32K bytes each. Their
addresses are:
Page 0:
bOOOO
- b7fff
Page I:
bSOOO
- bffff
Since Page I uses
the
memory
address
which
is normally reserved
for
the
Color/Graphics adapter,
when
the
user
wants
to
access this
page, make
sure
you
have:
I)
no
other
video adapter
in
the
system, OR
2)
a
second
ATI
Graphics Solutions
which
is
set
to
Color/
Graphics
mode
or
emulation mode, OR
3)
another
video adapter
which
can
co-exist
with
the
Hercules
graphics mode.
The
byte
which
contains
the
pixel location at coordinates
(x,y)
is
offset into
the
page
memory
by:
(2000·
(y
MOD
4)
) + (SA • INTEGER
(y
MOD
4)
) +
(INTEGER
(xiS))
The
bit
position
where
the
pixel information is
stored
in that
particular
byte
is:
7-(xMODS)
where:
x is
between
0
and
719
y is
between
0 and
347
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