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<TITLE>Int 13/AH=16h
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Int 13/AH=16h - FLOPPY DISK - DETECT DISK CHANGE (XT 1986/1/10 or later,XT286,AT,PS) -
AH = 16h
DL = drive number (00h-7Fh)
SI = 0000h (to avoid crash on AT&T 6300)
Return: CF clear if change line inactive
AH = 00h (disk not changed)
CF set if change line active
AH = status
01h invalid command (SyQuest)
06h change line active or not supported
80h drive not ready or not present
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<h2>Int 13/AH=16h
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<h3><font color=#C00040>FLOPPY DISK - DETECT DISK CHANGE (XT 1986/1/10 or later,XT286,AT,PS)</font></h3>
<PRE>
AH = 16h
DL = drive number (00h-7Fh)
SI = 0000h (to avoid crash on AT&T 6300)<br>
<p><b>Return:</b><br>CF clear if change line inactive
AH = 00h (disk not changed)
CF set if change line active
AH = status
01h invalid command (SyQuest)
06h change line active or not supported
80h drive not ready or not present
</PRE>
<p><b>Notes:</b>
Call AH=15h first to determine whether the drive supports a change
line.
This call also clears the media-change status, so that a disk change
is only reported once
<p><b>BUGS:</b>
Some versions of Award 386 Modular BIOS and AMI BIOS fail to clear
the media-change status.
AT&T 6300 WGS systems crash if SI <> 0 on entry..
Some pre 1986/08/04 Compaq ROM BIOS have a serious bug where this
function may re-configure a hard disk depending on what is located
at ES:[BX] and data indexed to by it. MS-DOS/PC DOS IO.SYS/IBMBIO.COM
install a special filter when they detect Compaq ROM BIOSes with
earlier dates..
Some Compaq 286 systems have a bug in all INT 13h functions >= 16h,
which causes the byte at DS:0074h to be destroyed when called for
hard disks (DL >= 80h). MS-DOS/PC DOS IO.SYS/IBMBIO.COM performs a
test on this bug using this sub-function, and if found installs a
special filter which points DS into ROM, so that it cannot cause
any harm..
Some drives (or controllers???) forget the change line status
if another drive is accessed afterwards. The DOS BIOS takes care
of this by not relying on the reported change line status when
the change line is not active and a different drive is accessed,
instead it reports "don't know" to the DOS kernel.
<p><b>See Also:</b>
<a href="rb-0639.htm" tppabs="http://www.ctyme.com/intr/rb-0639.htm">AH=15h</a> - <a href="rb-0716.htm" tppabs="http://www.ctyme.com/intr/rb-0716.htm">AH=49h</a>
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<b>Category: <a href="cat-003.htm" tppabs="http://www.ctyme.com/intr/cat-003.htm">
Bios</a>
- <a href="int-13.htm" tppabs="http://www.ctyme.com/intr/int-13.htm">
Int 13h</a>
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