INT 13,15 - Read DASD Type (XT BIOS from 1/10/86 & newer)

AH = 15h

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

on return:

AH = 00 drive not present

= 01 diskette, no change detection present

= 02 diskette, change detection present

= 03 fixed disk present

CX:DX = number of fixed disk sectors; if 3 is returned in AH

CF = 0 if successful

= 1 if error

- XT's must have a BIOS date 1/10/86 or newer

- used to determine if ~INT 13,16~ can detect disk change

- see ~INT 13,STATUS~