Int 62 Fn 003A u - Fgdriver V4.02 - "fg_getattr" - Get Character Attrib [V]
AX = 003Ah
BX = row
CX = column
Return: AX = character attribute at specified location on active video page
Notes: the FGDRIVER functions are rearranged with each major release, but
their parameters do not change (see #3145 at AX=0000h)
This call is ignored in graphics modes
See Also: AX=000Bh,AX=003Dh,AX=0040h,AX=00A6h