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oldlinux-files/docs/interrupts/int-html/rb-4130.htm
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<TITLE>Int 2A/AX=0300h
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Int 2A/AX=0300h - NETWORK - CHECK DIRECT I/O -
AX = 0300h
DS:SI - ASCIZ device name (may be full path or only drive specifier--
must include the colon)
Return: CF clear if direct physical addressing (INT 13,INT 25) permissible
CF set if access via files only
Notes: do not use direct disk accesses if this function returns CF set or the
device is redirected (INT 21/AX=5F02h)
use AH=00h to determine whether the network is installed; if not,
direct physical access is allowed
may take some time to execute, so programs which need to check
">
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<h2>Int 2A/AX=0300h
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<h3><font color=#C00040>NETWORK - CHECK DIRECT I/O</font></h3>
<PRE>
AX = 0300h
DS:SI -> ASCIZ device name (may be full path or only drive specifier--
must include the colon)<br>
<p><b>Return:</b><br>CF clear if direct physical addressing (INT 13,INT 25) permissible
CF set if access via files only
</PRE>
<p><b>Notes:</b>
Do not use direct disk accesses if this function returns CF set or the
device is redirected (INT 21/AX=5F02h).
Use AH=00h to determine whether the network is installed; if not,
direct physical access is allowed.
May take some time to execute, so programs which need to check
frequently should save the result of the first call.
This function is called by the DOS kernel on INT 25 and INT 26.
Supported by PC LAN Program, LAN Manage, LANtastic, NetWare, 10NET,
etc.
<p><b>See Also:</b>
<a href="rb-0607.htm" tppabs="http://www.ctyme.com/intr/rb-0607.htm">INT 13/AH=02h</a> - <a href="rb-0608.htm" tppabs="http://www.ctyme.com/intr/rb-0608.htm">INT 13/AH=03h</a> - <a href="rb-4113.htm" tppabs="http://www.ctyme.com/intr/rb-4113.htm">INT 25</a> - <a href="rb-4117.htm" tppabs="http://www.ctyme.com/intr/rb-4117.htm">INT 26
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Network</a>
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Int 2Ah</a>
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