Compatibility: VGA
Expects: AH    12H
BL    34H
AL    setting: 00H enable cursor emulation
01H disable cursor emulation
                                                                  
Returns: AH    12H if a valid value was passed in AL
                                                                  
Info: This updates bit 0 of the EgaMiscInfoRec (at 0040:0087).

When cursor emulation is in effect, the BIOS assumes that input
to INT 10H 01H (set cursor size) is meant to be relative to a
CGA-style 8x8 character matrix and it automatically adjusts
(scales) the input values to match the true character matrix.

See Also: INT 10H 12H (EGA/VGA Special Functions/Alternate Select)
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INT 10H 12H BL=34H: Cursor Emulation (Scaling)