If
there
is only one adapter,
then in EGA mode, the
equipment
flag forces a color or monochrome mode to be set,
with conversion if necessary.
If
there is more than one video adapter in the system, the
equipment
flag
setting at the time of the set mode call
determines
if the mode
should be
set in the color or
monochrome adapter.
If necessary,
color modes will be
converted to monochrome mode 7
and monochrome modes to
color mode 3.
In VGA mode, the equipment flag automatically gets changed
to agree with the mode being set.
AH=1 Set cursor type (start and stop scan lines)
Input:
CH=start scan line for cursor.
CL=end scan line for cursor.
Output:
None.
Note: Only bits 0 through 4 should be set.
AH=2 Set cursor position.
Input:
BH=page for which cursor is to be set.
DH=row position cursor is to be set to.
DL=column position cursor is to be set to.
Output:
N o n e .
Note: (0,0) is upper left of screen.
AH=3 Read cursor position.
Input:
BH=page for which cursor is to be read.
Output:
CH=current start scan line for cursor.
CL=current stop scan line for cursor.
DH=row position of cursor in selected page.
DL=column position of cursor in selected page.
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Содержание Qtec VGA 1024
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