INT 13,10 - Test for Drive Ready (XT & newer)

AH = 10h

DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)

on return:

AH = status (see ~INT 13,STATUS~)

CF = 0 if successful

= 1 if error

- many good programming references indicate this function is only

available on the AT, PS/2 and later systems, but all hard disk

systems since the XT have this function available