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oldlinux-files/docs/interrupts/int-html/rb-0667.htm
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<TITLE>Int 13/AH=20h
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Int 13/AH=20h - Compaq, ATAPI Removable Media Device - GET CURRENT MEDIA FORMAT -
AH = 20h
DL = drive number (00h,01h)
Return: CF clear if successful
AL = media type (see #00265)
AH = 00h
CF set on error
AH = error code
01h invalid request
30h drive does not support media sense
31h no such drive / media not present
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<h2>Int 13/AH=20h
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<h3><font color=#C00040>Compaq, ATAPI Removable Media Device - GET CURRENT MEDIA FORMAT</font></h3>
<PRE>
AH = 20h
DL = drive number (00h,01h)<br>
<p><b>Return:</b><br>CF clear if successful
AL = media type <a href="rb-0667.htm#Table265" tppabs="http://www.ctyme.com/intr/rb-0667.htm#Table265">(see #00265)</a>
AH = 00h
CF set on error
AH = error code
01h invalid request
30h drive does not support media sense
31h no such drive / media not present
32h non-default media / drive does not support media type
</PRE>
<p><b>Notes:</b>
This function is supported by the 1993/3/8 Compaq ROM BIOS, but only
partially (AL is always 00h when successful) by the 1993/8/3 version.
This function is also supported by some recent versions of the Phoenix
486 BIOS.
This function does not seem to be supported by some Toshiba BIOSes
(at least before 1995, maybe some laptops??? with 1.44 MB floppies),
because S/DOS 1.0 contains code to bypass a call to this function,
always assuming the drive would not support media sense.
<p><b>See Also:</b>
<a href="rb-0639.htm" tppabs="http://www.ctyme.com/intr/rb-0639.htm">AH=15h</a>
<PRE>
<p>
<a name=table265></a>
(Table 00265)
Values for Compaq/ATAPI diskette media type:
03h 720K (1M unformatted)
04h 1.44M (2M unformatted)
06h 2.88M (4M unformatted)
0Ch 360K
0Dh 1.2M
0Eh Toshiba 3mode
0Fh NEC 3mode (1024-byte sectors)
10h ATAPI Removable Media Device
</PRE>
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<b>Category: <a href="cat-044.htm" tppabs="http://www.ctyme.com/intr/cat-044.htm">
Vendor-specific BIOS Extensions</a>
- <a href="int-13.htm" tppabs="http://www.ctyme.com/intr/int-13.htm">
Int 13h</a>
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C</a>
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