Int 62 Fn 003D u - Fgdriver V4.02 - "fg_getchar" - Get Character For Scr [V]
AX = 003Dh
BX = row
CX = column
Return: AX = character 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=003Ah,AX=0096h,AX=00A6h,AX=00C8h