Tseng Qtec VGA 1024, Installation Manual

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AH=4 Read light pen position
Input:
N o n e .
Output:
AH=0 then light pen switch not activated, return values
invalid.
1 then light pen switch activated, valid values
returned.
BX=pixel column.
CH=raster line.
CX=raster line (new graphics modes).
DH=row of character light pen position.
DL=column of character light pen position.
AH=5 Select active page.
Input:
AL=page to select as active page.
Output:
N o n e .
AH=6 Scroll up active page.
Input:
AL=number of lines rows are to move up.
0 means blank window.
BH=attribute used to fill blank line or lines at bottom.
CH=row of upper left corner of scroll window.
CL=column of upper left corner of scroll window.
DH=row of lower right corner of scroll window.
DL=column of lower right corner of scroll window.
Output:
None.
AH=7 Scroll down active page.
Input:
AL=numberr of lines rows are to move down.
0 means blank window.
BH=attribute used to fill blank line or lines at top.
CH=row of upper left corner of scroll window.
CL=column of upper left corner of scroll window.
DH=row of lower right corner of scroll window.
DL=column of lower right corner of scroll window.
Output:
N o n e .
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