Int 62 Fn 000A u - Fgdriver V3.03+ - "fg_capslock" - Get State Of Capslo [V]
AX = 000Ah
Return: AX = CapsLock state (0000h off, 0001h on)
Note: the FGDRIVER functions are rearranged with each major release, but
their parameters do not change (see #3145)
See Also: AX=0082h,AX=00A4h,AX=00A8h,AX=00B1h