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    In text display modes, the video hardware causes the cursor to blink,
    and the blink cannot be disabled. In graphics modes, the hardware cursor
    is not available.
 
    The default values set by the ROM BIOS are:
 
    Display                     Start         End
    ═══════════════════         ═════         ═══
    monochrome mode 07H         11            12
    text modes 00H-03H          6             7
 
    On the EGA, MCGA, and VGA in text modes 00H-03H, the ROM BIOS accepts
    cursor start and end values as though the character cell were 8-by-8, and
    remaps the values as appropriate for the true character cell dimensions.
    This mapping is called cursor emulation.
 
    You can turn off the cursor in several ways. On the MDA, CGA, and VGA,
    setting register CH =20H causes the cursor to disappear. Techniques that
    involve setting illegal starting and ending lines for the current display
    mode tend to be unreliable. An alternative method is to position the cur-
    sor to a nondisplayable address, such as (x,y)=(0,25).
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