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<TITLE>Int 21/AX=4403h
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<META NAME="Description" CONTENT="
Int 21/AX=4403h - CD-ROM device driver - IOCTL OUTPUT -
AX = 4403h
BX = file handle referencing character device for CD-ROM driver
CX = number of bytes to write
DS:DX - control block (see #01524)
Return: CF clear if successful
AX = number of bytes actually written
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes: some device drivers support several subunits (that is more than one
drive) but it is not possible to distinguish between them with this
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<h2>Int 21/AX=4403h
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<h3><font color=#C00040>CD-ROM device driver - IOCTL OUTPUT</font></h3>
<PRE>
AX = 4403h
BX = file handle referencing character device for CD-ROM driver
CX = number of bytes to write
DS:DX -> control block <a href="rb-2856.htm#Table1524" tppabs="http://www.ctyme.com/intr/rb-2856.htm#Table1524">(see #01524)</a><br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually written
CF set on error
AX = error code (01h,05h,06h,0Dh) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Notes:</b>
Some device drivers support several subunits (that is more than one
drive) but it is not possible to distinguish between them with this
function; use INT 2F/AX=1510h or INT 2F/AX=0802h instead.
Under Windows95, the "mscd$$$$" device cannot be opened so you cannot
<PRE>
<p><b>obtain the handle required by this function:</b><br>Use INT 2F/AX=1510h
or INT 2F/AX=0802h instead
</PRE>
<p><b>See Also:</b>
<a href="rb-2829.htm" tppabs="http://www.ctyme.com/intr/rb-2829.htm">AX=4402h"CD-ROM"</a> - <a href="rb-4282.htm" tppabs="http://www.ctyme.com/intr/rb-4282.htm">INT 2F/AX=0802h</a> - <a href="rb-4493.htm" tppabs="http://www.ctyme.com/intr/rb-4493.htm">INT 2F/AX=1510h</a>
<PRE>
<p>
Format of CR-ROM control block:
<a name=table1524></a>
Offset Size Description (Table 01524)
00h BYTE function code
00h eject disk
01h lock/unlock door
02h reset drive
03h control audio channel
04h write device control string
05h close tray
---functions 00h,02h,05h---
no further fields
---function 01h---
01h BYTE lock function
00h unlock door
01h lock door
---function 03h---
01h BYTE input channel (0-3) for output channel 0
02h BYTE volume for output channel 0
03h BYTE input channel (0-3) for output channel 1
04h BYTE volume for output channel 1
05h BYTE input channel (0-3) for output channel 2
06h BYTE volume for output channel 2
07h BYTE input channel (0-3) for output channel 3
08h BYTE volume for output channel 3
</PRE>
<p><b>Note:</b>
Output channels 0 and 1 are left and right, 2 and 3 are left prime and
right prime; a volume of 00h is off
---function 04h---
01h N BYTEs bytes to send directly to the CD-ROM drive without
interpretation
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