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INT
51
h,
Function
E
-
Blank Screen
Region
Entry:
AH
=
E
(function
code)
CH
= number
of
columns
CL =
number
of
rows
DH
=
start
column
number
DL =
start
row
number
Exit:
No
registers specified
This
function
causes a
rectangular region
on
the
screen
to
be
blanked.
The
start
column and
row
specify the
upper
left
corner
of
the region
to
be
blanked.
The
current
screen
mode
(reverse/normal)
is
ignored,
and
the
blanked
region
will
be
cleared
so
that
all
pixels
are turned
off.
The
reverse video
attribute
bits for
the
specified region
must
also
be
cleared.
This
function
does
not
affect
the cursor
location or
the current
setting of
the reverse video
mode.
142
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