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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
 
     In text modes 00h-03h on the EGA, MCGA, and VGA, 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 cursor to a nondisplayable address, such
     as (x, y)=(0, 25).
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