Compatibility: All
Expects: AH    08H
BH    video page number (0-based)
                                                                  
Returns: (none)
AL    character read
BH    video attribute (text modes only)
                                                                  
Info: This obtains the ASCII character code and the Video Attribute of
the character at the current cursor location.

When the screen is in graphics mode, BH (the character color) is
not returned.

To read the screen at a particular location, use INT 10H 02H (set
cursor location) before calling here.

This is too slow for most apps.  See Video Memory Layouts.

See Also: INT 10H 09H (write char/attr to cursor location)
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INT 10H 08H: Read Character/Attribute at Cursor Location